you may want to go back and check the rod and mains a new crank may not do much if the bores are to big on the rods and mains if this was done recon rods and a line bore or hone and on a chevy running oil clearances on the rods and main can be any were from .001.5 to 003 so you need to go back and read back thru the old post i can not tell you any thing new on this and i do not think anyone can .with out really looking at your engine .