64 slant 6 4 spd to v8 and 9 to 10" drum questions.

The steering linkage is different too. You definitely will need the proper '64-6 A-body V8 drag link, motor mount brackets, and LH exhaust manifold. Also, from your photo, it looks like your engine is hooked to an automatic. It's likely that the crankshaft is not finish machined for a pilot bushing. Either the crank will have to be machined to the proper diameter to accept a stock bushing, or a bushing would have to be made to fit the crank. You may also need the correct brackets and kickdown linkage for the early cars. Not sure if there's enough clearance for those or not. I would also recommend a higher capacity radiator and fan.