While my 401 is a good running engine I have no clue if it's ever been rebuilt or anything along those lines. I wanted to find a different engine to build so I can continue to drive and enjoy the car while doing the build. I found a local 1964 standard bore 425 engine . I can buy just the short block for $475 or the long block for $650. The seller is a very reputable local Buick restore and he says he will guarantee the engine to be rebuildable. Did he seem like fair prices? And is there anything about the 64 that makes it worse or better than the later engines? I plan to put a factory dual quad setup on it so the extra cubic inches are appealing to me.