A 283 and 307 both have the same bore. A 327 crank has the same stroke as a 307(so the piston deck height is fine). The problem is... the 327 crank. A 283 only came with a small main journal crank(2.30"), but 327's came with both a small main and large main(2.45") journal crank. If the journals measure 2.30" or near that(turned down) you will be fine. Still I would assemble the short block "dry" to make sure you have what is said to be. Hope this helps.