Looking to buy a first gen firebird. I had a 75 Trans Am in the early eighties. Can someone help decoding cowl tag? It would be much appreciated!
There seems to be more information on camaro’s and it’s a bit frustrating.

Welcome to the 1st Gen site.

In a different part of this site is body tag info, including an analyzer, accessed by the years above:

https://firstgenfirebird.org/1967-info/1967-technical-information/1967-body-tag-information/

It seems to provide limited information? How do you determine engine and transmission? I’d actually seen this before, which I tracked down to this site. It seems very difficult to follow or is it my imagination?

The engine type is not on the body tag.
Its the 8th digit on the VIN
But it will only tell you is it came with a V6 or a V8

Is there any way to determine if it was a 326 or 400?

There are 400-specific features on the car but those can get added/removed in 58 years; hood scoop hood, grill chrome "L-shaped"(aka hockey stick) instead of straight, hood and trunk 400 emblems, chrome valve covers (instead of painted), front bumper Pontiac arrowhead. The '68 air cleaner has a chrome lid. I don't recall for the '67.

If the engine is original it will have the codes, as shown on: https://firstgenfirebird.org/1967-i...n/1967-drivetrain-id-number-information/ However, engines can be replaced. I believe the VIN stamping on the engine only began in '68 so the confirmation of originality can only be done with the engine serial number verses the PHS.

The trans numbers and type are also found on the above page.

However, the only sure way I know how the original equipment is ordering (for a fee) the as-built documentation from Pontiac Historical Services (PHS).