If you can see if you can find the "goody" 283 block this has the uderside of the crankcase, the bottom of the cylinder bores. Where this area is rounded to clear the larger swing of the 327 crank stroke, these blocks can be safely bored to 4.000 inch +

The only thing i am trying to remember is do you run the stock weight 302 pistons on the 283 crank. I suppose one way to check is to weigh a 283 piston and then a 302 piston, just to be sure. Just be aware that the small journal rods run the smaller 11/32" rod bolts as opposed to the later big journal rod bolt sive 3/8" rod bolts