I have a 71 400 with 4 bolt mains going in Ashley's 88 SS. I found a buyer for her stock 350,and I've been finding the parts for this build for about a year.
71 block.
Procomp H-Beam rods.
Cast 20 over speedpro pistons.
Brodix aluminum heads.
Weiand Team G intake manifold.
We can come up with some go fast parts to get the 350 moving.. Maybe a nice 4:11 posi,that'll get the launch he's looking for.Trans brake,with a nice converter,you'll be looking at his rear quarter for a little bit.