Buy a NEW Eagle crank Have the rods checked, all of them & have everything rebalanced with new bearings & all new gaskets including the head gaskets & make sure you have the block cleaned & flushed to get all of the junk out of it so there no metal shavings in it anywhere put it back together & you'll have a nice new engine. How many miles on it.?? If it has more them 50K on it make sure you do a valve job on it to. Depending on how much you have to pay for it & how much you have to play with you may just want to skip the valve job on those heads & see if you can find a set of 191 alum. heads as they flow better & then do the valve job on them. Those heads will give you about an extra 40 or so HP. It just depends on how much you have to play with.