Howdy Gary,
The 390 blocks and the 428 blocks are the same. So, just run a '63 390 block w/ 428 crank, rods, and pistons and have your cake and eat it too!
Had a '66 428-4V and a '70 428SCJ and the casting code on the block said 352 (its on the driver side front of the block, right below the head, by the water pump). Most FE's say 352 except the side oiler 427's and a few others.
P.S. I live in the great state of Arkansas where we DO NOT have an auto inspection! For a kit car all you have to do is fill out a little paperwork, have the State Police to look at it so they know its not stolen an give them about $25.00, a copy of your paperwork, insurance card and walk out w/ you tags.
Its that easy!