Any G-body is cool. You need to place the frame mounts in the right holes for the 301 type 78-80 cars. Use the 3 bolt motor plates and locate everything with the 350th on it from the trans crossmember. Very easy swap. I have a 81 GP that currently has a wore out 455 in it, but I am looking at redoing a 400 for it. Just need to make up my mind.
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