I think since you are this far into it - go ahead and hot tank the hard parts (crank, valve train parts, and block head etc.) get the valve guides replaced, and valve job and then reassemble using the 30 over pistons and the crank bearings, assuming you kept all that stuff in their original orientation. I'd throw new rings in after a light honing of the cylinders as 55 fargo suggests. You might want to shave the head to bring up compression - figure that sticks in my mind is 0.090 " for an uncut 218 head, but you should do your own research to verify. Someone on the site figured out what the standard uncut head thickness should be so you can make a judgement about whether the head has been significantly cut previously. Its best to CC the heads and block and do a calculation to accurately figure out the comp ratio. and how much to shave. Ideally 8:1 is your target unless someone thinks otherwise.