I can't imagine any 48 yr old block having absolutely perfect 4.000" bores without taper, etc. If you really want to do it right, I would suggest going 0.030" over and using any aftermarket LT1-style piston.
I guess you could get away with stock pistons and standard bore if you have a really great block, only want to idle onto a show field, and don't mind loose piston-to-bore clearance. These cars were driven hard when new, and it's pretty likely that they will ALL have some bore wear.
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