I have a 326 Firebird with a 4bbl Edelbrock performer 600cfm carb and performer intake and Black Jack hedders. I want to put my 326 aside and build a low budget 350.

My finances are low so I can't afford to build a 400 or 455
I met this great guy a few months ago that has a lot of Pontiac engine parts. He has just purchased a 455 for his 69 Firebird and is offering me the 350 that is in his car for a good price as a running motor less the heads. It is not the original 350 for the car and all I can say he is running low 15's with an th350 and a posi rear (not sure what gears he running)

Now for my question he has 3 sets of heads i can choose from These are #11 1970 D-ports from a 350 cu in with 1.96/ 1.66 valves @ 73 cc. And I have a set of # 7H1 heads. These are 1972 D-ports from a 350 cu in with 1.96/ 1.66 valves @ 80 cc and the last set is from the 455 motor he has just bought they are 6x heads that have been skimmed a little just to true them up and have 2.11/1.66 valves and roller rockers.

I get my heads info from here.

http://wallaceracing.com/head1.htm

i have a copy of Jim Hand how to build max performance Pontiac V8's and it says the difference between a motor with 8:1 and 10:1 compression is worth 6% in total power.

which heads would be best or would I be better off putting my 326's 140 heads which are 9.2:1 cr on the 350 motor because I think all these heads will be a lower cr.

He is also offering me a Pontiac N cam which according to my Jim Hand book is 273/282 advertised duration 197/206 @.50 duration 111.5 lobe separation and 107 intake centerline

I have a B&M holeshot 2000 high stall converter ready to go in and that is left to get the car to hook is a posi rear and some better gears as I have 2.56 open gears.