Opinions

Go with the 360! Need 64-66 A body 273 mts & add (weld) an ear and drill a hole in the added ear to match the block ears on the one side (hold the mts up to the block & you'll see what needs to be done & it is a piece of cake). Have your machine shop drill the flywheel to convert it to external balance (they need a big drill bit & some trigonometry to convert the MP diagram). 68-70 340 HP ex manifolds & may need some light fabbing so the st col can pass by the dr mani. early A tolerances are the worst & you MAY be OK as is (mockup & go from there). manual steering with its longer column is a good plan for that and some cases shortening the coupler so it dont hit the bend in the mani will work. alum later pump for a pass side radiiator and the 273 iron pump for a dr side rad inlet nipple. I ain't done this (yet) but a manual box and a PS shorter (inner) shaft in your column then use a firmfeel extension may be a plan (anyone tried this?). You need a "392" oil pan with its matching pickup which has a sharp bend compared to the 876 pans' long sweeping bend of its pickup