Nice!!! I loved the GTO's of that era!!! One of my classmates when I was in high school had one.What muscle car did you own, I started with a 68 goat,
1963 Chevy Biscayne (poor man's Impala), straight 6, 2 speed Powerglide. I eventually put a used 350 and a TH350 in there when the 450K mile straight 6 started popping plugs out of the sockets (a mechanic had partially cross threaded a couple or used the wrong ones, and wore part of the threading), the used 350 cracked a piston along the ring ridge going up the Throgs Neck Bridge, and I had to be towed home from there. I then built my own 350, put it in there, and drove it until it was crashed into a guardrail.
1965 Chevy Impala SS 283, 4 speed Muncie gearbox. The original 283 was toast when I got it, so I got it for a great price. Swapped in my 350 with a shatter plate and new bell housing and later model starter to mesh with everything.
My best friend at the time had a 1970 Ford Mustang fastback with the 351W. We spent a lot of time working on cars together, lol.