Dear trmnatr, I used to run a 327 in my car and did my own machine work at the shop I worked at. The crankshaft you have +/- .015. As far as the block goes be very carefull when you mill it because when we did mine you have to take so much off we started pulling threads out of the block so I had to start putting in heli coils in. You can run any piston/pin combo you want. Rings are the same way. You can use any size valve spring you want. More than likely you will be using a triple spring on both intake and exhaust. What I would do is take the weaker ones and put them on the ex. and put the new ones on the in. Any water is legal and the best thing is a belt drive from jesel or comp cams. If you have any other question you can contact me at
maverickmotorsports5456@msn.com
Bobby Stevens