[screamingchief]

If your willing to replace stuff like rods and pistons,might wanna look into the eagle 6.635" long rods to save the crank using the 4.21" stroke.

With the eagle rods you end up going to the BBC rod journal as SOP,only catch is that rod also uses the BBC pins,so you either have to modify the existing pontiac pistons for the .990" BBC floating pins,or get some pistons that are already set-up for them.

Or I guess you could rebush the 6.635" eagles for a .980" pontiac pin,but I digress.