I will add the following, which were clipped directly from the auction...all non-stock:
350/325Hp New Crate Engine (20 Miles),,, HEIDTS Subframe... Rack & Pinion Steering... Wilwood Disc Brakes (Front)...Disc Brakes Rear... Vintage Model Air Conditioning (New)... Flaming River Tilt Steering... M21 4 Spd Transmission... Krager Wheels w/Mickey Thompson Tires (New)... New White Convertible Top (Manual),,, Flowmaster Dual Exhaust,,, All New Upholstery... Engine competely new (Holley 4 Barrel, Water pump, Alt, Hoses, etc...MSD Ignition)...
I could rattle another huge list beyond above of non-original items I can see right there in the pics...trunk spoiler is quite glaring, but a common "period correct" add-on stolen from a Camaro...and my 68 'vert also has the same spoiler...cuz I like it. Purists hate it. I don't care what purists think. It's my car.
So you've never really said whether originality is an issue for you or not. If originality is a concern, then this is absolutely not the car for you. It's a LONG ways from original. But if it has been well-built, this car could be a fantastic driver...BETTER than original. Frankly, other than the color, I really LIKE the list of mods he has done...they meet my personal taste. But meeting my taste does not equate to monetary value. ALL of these mods tend to detract from resale/collectable value, and make returning to original a great challenge if that is a future priority. If returning to original is NOT a priority, then it might be a "so-what" moment for you, and if you like the car, then try working a deal on the car...beauty is ALWAYS in the eye of the beholder...and in the eye of the buyer.
So all that said, if you're looking for a fun, somewhat modernized/improved?/modified driver, this one might fit the bill nicely if you like the look/features on this car and if the quality is there. IMO this car is really better characterized as a resto-mod/custom than it is even a '68 Firebird. I'd go so far as to call it a kit/catalog car, that used a '68 Firebird body as a basis to build from. This car happens to still look like a 68 Firebird, but nearly everything except the general body panel shape has indeed been changed. If you like that, it's a good thing. If you want original, it's a bad thing.
Photos are not clear enough to show many things. Undercarriage and paint condition primarily are my concerns. It looks like a good 20 footer, but I really wonder about the gloss of that paint...something there just looks wierd...where are the reflections? Looks like heavy heavy orange-peel? Or EXTREME metalflake/pearlcoat? Or maybe it's just the low quality of the photos that's throwing me off...
If the car is indeed solid as a rock, paint meets your quality standards, and you want just a fun driver, and above all YOU LIKE IT as it sits, then I think the price is passable and this car may be worth looking into...and as you certainly also realize, maybe the price is flexible? I can pretty well guarantee this car won't meet reserve and won't sell, but you might chat with the owner and may agree to a lower bottom dollar, and get a better idea of up-close condition.
He makes ZERO mention of the condition of anything at all, except for listing the obvious new parts. Distant photos can hide LOTS. And this auction is 100% distant photos, except the close-up of the tach which is blurry (intentionally blurry??) Just beware. It might be a fine car, but nobody here knows. There are lotsa lotsa questions to be answered before anyone can make a solid judgement based on this particular Ebay auction...so if you're interested, start asking MANY questions of the seller before road-tripping to inspect...this car could be straight as an arrow...and it could also be carrying 240 pounds of body filler over gaping/hidden rust holes...