Why bother? Bore the 283 .060 oversize ( 292 cubic inches), use Speed-Pro hypereutectic flattop pistons, and a set of 58CC 305 heads retrofitted to use 1.6" exhaust valves, and do a little pocket porting to open up the exhaust flow a little. Run a 268 degree duration Comp Cam (part # 268H) and a set of Comp anti-pump-up lifters. With the right carburetor you'll have a 6,000+ RPM capable engine with the same throttle response as the 301/302 Z-28 Camaro engine without the outrageous cost. The short stroke crankshaft makes the little engine wind up fast, and the extra 15 cubic inches or so gained by going to the 1/8" overbore isn't worth the cooling problems you'll encounter with the overbored 283 block. If you just have to have 301 cubic inches for some silly reason, find a small-journal 327 block and put a 283 crankshaft in it.
I've built approximately 200 dyno-tuned 301/302's for circle track racing over the past 40 years, so I'm not blowing smoke like some of the self-appointed experts on the forums I've seen.
Jerry
