magnum heads

If both of them flo the same after your ported LA heads the magnums are "still" better IMO because of there closed chamber, but there most likely cracked between the seats as stated so i wouldn't spend a dime on them, throw em in the trash if there cracked. I can see why you got that engine for free, a good running one hardly fetches 350-400.00 in most areas, so with a knock it isn't worth much if anything, unless you want the EFI system or manifolds, but hey, Free IS Free right.