Stock intake vs performer?

71dusterdan said
... Only question left is which heads? My J's or my magnums. That will depend on pistons and condition of both sets of heads. For obvious reasons I am hoping the J's are good, and I can find a piston to work...

I've never seen a cracked J head, good luck with the magnums. I would definitely Magneflux the Magnums.

The opened up Plenum on the stock intake is for a little more power at higher RPM.