Slant Six to Big block Engine swap in a 74 dart sport.

With the late steering linkage you should be able to use any factory big block oil pan (I'm going to find out later this year, maybe). Go with bigger torsion bars and a sway bar for the street. Heavier rear springs, too. "B" or "RB" have their own fitment areas, but they both fit with power steering. Some headers won't work with power steering, though. We run B-body HP manifolds on our cars..