once upon a time I bought a 69 cutlass with a 455. P/O had just honed cylinders and trimmed down oversize rings over stock pistons. it was an awesome car for 4 weeks, before I had to do a full mechanical teardown. moral of the story is you can get a full rebuildd kit from J. C. whitney for $180 inc. correct size pistons. But while you have it torn down why not hot tank and magnaflux block + heads, so you can be sure you won't have to pull the block 2 months down the road? when you replace parts that have worn in unison with new parts, it puts more stress on the old parts that have not been replaced. it just makes sense- especially for a daily driver- to recondition all parts that are not being replaced to cut stress levels to negligable levels. and dont be afraid to put your micrometer on everything in the engine!