Larry, I am running a 383 and love it. Mine is an older block(70's) so i think you may have a different rear main seal setup though. In my set up the block had to be notched slightly for the crank clearance but it was no big deal.(bottom of the cylinder walls and oil pan rail) I used the 5.7 inch rod and standard .030 over forged pistons. One issue that you may have is the cam/crank interferance. I have heard of this in some blocks. I beleive that if you run a smaller base circle cam it will not be an issue. Hope this helps a little.