I put a 1975 360 A motor in my 50 Ply wagon. Had the machine work done by a reputable shop. Got back a short block, crank and pistons already installed. Put it together with powersteering pump, new aluminum manifold, new Holley carb.......and have about a total of 3K in a turn key motor and not have to worry about computers, O2 sensors in exhaust etc. Always remember......KISS......keep it simple stupid.