Very cool piece of Pontiac history.
When I was in HS my best friend had a ‘64 GTO 389 tri power four spd car. It had been his brother’s but sadly he didn’t return from ‘Nam. He and I went to get a ‘62 SD 421 with the dual four setup that was advertised for sale in a local newspaper. Remember those? Complete engine, starter on the left side of the block. Fan to bellhousing, air cleaners to oil pan with the long cast headers. The engine was all complete. I think it had a Mckellar 11(?) cam Plucked out of a lightweight Catalina. He swapped the engines as the old 389 was well beyond tired. The county could have used the car for mosquito abatement. Man did that car fly with the SD in it. But he then decided to put on an early set of Ram Air heads. He then had the SD dual quad manifold planed off to fit the RA heads. I don’t remember if he had to have adapter plates made or just shaved the flanges. I just shook my head knowing how rare a complete SD 421 was. He still has the GTO up in Idaho somewhere.
At the same time, I had my ‘62 409/409, the “Bracket Jumper” ‘61 SS drag car and a 64 Chevelle that I had dropped the 409 engine from the BJ. I took off the M/T and put a single manifold on with an adapted Holley 1050 cfm 3 bbl. I had a Chrysler 2.64 low 4 spd and a l’57 Olds with a 4.88 posi on lift bars. We would go out at lunch time and drag race in front of the HS. I eventually scrapped the Chevelle. The engine later getting a set of Algons running on Methanol and out into my nostalgia 23T altered.
I keep taunting him to bring the GTO back out to Ca for a HS reunion and a grudge race against my ‘62. 45 yrs later and he hasn’t come back yet. I think his scared..