If they have any miles on them, they will more than likely be cracked beyond repair between the seats. I have had several sets dropped off for rebuild and porting and have yet to do a set. I set them up with a good set of LA heads and oil the rockers like a BB Indy head except through the rear shaft bolt with a 3/32" hole drilled from the bottom up. I do think there are affordable aftermarket magnum heads now. Engine Quest I believe.