Not sure how I missed this forum, as it looks like a great source for the Pontiac enthusiast! I've owned my gto since 97... It was originally just a plain jane 400 350hp 4 speed car -- it was painted orbit orange with judge stripes in 92 and was used as the 2nd car in "dazed and confused".
It currently has a 70 455 with #13 heads and an m-21. Over the past 10 years the car has been repainted, new vinyl top, new interior, rebuilt front suspension and so on.... It runs ok on today's gasoline -- working on a more suitable drive-train for modern fuel. Even when gas was still gas it would tend to ping on hot summer days. (It does have forged pistons and has held up well). I have a 73 455 with 6x heads sitting on my engine stand -- I may swap that in and see how it does.
Back in the late 90's I drove the car roundtrip from NC - AZ two different times! As of lately it's spent a good bit of time in the garage but I'm planning on driving it a lot more this year.
Looks like a great forum; looking forward to contributing...