A 20/30 crank isn't bad, but that will probably be the last time it can be reground. Does your engine have the large or small journal size? Early 327 engines and the first year of the 302 (Z-28) Camaro engines had 2.000" connecting rod bearings. Later ones have the same size rods as a 350, 2.100" diameter. The main bearings are also larger on the later engines, but I don't remember those dimensions off the top of my head. Small-journal 327 cranks are just a little hard to find these days.
Jerry

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