I put a 400 in my 78 GP, which is also a G-body, withut issue. I used RamAir Manifolds from RARE with a Pypes exhaust and it fit great. The motor mounts on the 301 are in the position as the later year V8s (like what you have) so that will fit no problem. You will need a different crossmember to fit dual exhaust as well as the longer trans. The cars originally only came with a TH200 or TH350.
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