Like Turbo_Jet, I have succesfully used sbc frame mounts in a 68 to locate the BBC. I had power steering as well, and all header clearance problems were resolved with a hammer and pipe. The heater core cleared as did the high rise manifold and holley carb under a standard hood, The air filter was 2.5 inches. The stock type drivers side rocker cover cleared the booster but I used the Vette/Chevelle angled unit. At 75.00 bucks each for the bbc frame mounts, it is worth trying. My brother and I used sbc mounts in his 78Z to hold his 540 Merlin no problem.