Yeah, Denny. My 68 Torino came with a 390 but they had the GT heads that were doubled drilled and specail exhaust manifolds to get past the shock towers. A standard 390 head and manifold arrangement wouldn't work without messaging the shock towers a little. I don't know if the 70/71 429 CJ's and SCJ's had special towers of if Ford found another way to get them in there.