I just saw a 62' Valiant/magnum 360 swap in one of the threads here at FABO and he used the truck manifolds, your 65' has a little more room,I bet if you found a pair for a 5.2 (318) magnum truck they would wake that 273 right up. he did say he milled 1/4" off of the mating surface for a little extra clearance, but like I said the 65's are a little wider .:thumbsup:
