I wonder where PM is coming from, I stated that although the AMC V-8's looked similar to the old Buick, it was not in any way a Buick design... The '67 through '69 AMC V-8's were the 290, 343 and 390, with rectangular exhaust ports. The next generation, starting in '70, were the 304, 360, 390 (last year for this in '70), and the 401 (starting in '71), and had the dogleg exhaust ports with better flow. The TH400 wasn't available until the end, and only on Jeeps. The early engines used B-W manuals and B-W automatics, later engines (I think it started in '71) used the B-W manuals and Torqueflite automatics. It's been many years since I drag raced AMC's, starting with a '69 AMX, '69 Javelin, '70 Rebel Machine, '74 Gremlin (of all things), and ending with a '83 Spirit AMX (converted to a '74 V-8 drive train). All with 40,00 volt coils... I know folks on here have a ton of experience with LR vehicles of all sorts, this is why it's a great source of information! But, I spent 34 years designing and re-designing all sorts of mechanical equipment. Have you ever wondered who had the first patent on the Energy Suspension style sway bar bushings, back in 1980? One guess... Oh, you didn't know Buick adopted the Chevy engine? That was after they had their own design 350...