Honestly unless your hung up on the date code correct thing...... I'd think about a FE 427 stroker if your looking to drop $5-7k into a engine. Bigger bore and more cubes!! You can still find a decent sideoiler block for under $3k. I've been seeing them in the $2500 range still std bore. Cleanup at .017. Most have a window repair but done right will be fine. You can buy a 4.125, 4.250 or stroker kit ready to go for $2k. Or a stock steel 427 crank or 428 iron crank, rods and pistons for a little less. If you don't mind iron heads you can find 427 and CJ heads fairly priced. Or stock aluminum Edels you can cleanup and port match. $1500. So for the same or little more money for the 428 you can build yourself a nice 427. Just look for the right deal. I also saw a complete 63 or 64 427 rebuilt for $7500. And that came with a set of old oem cast headers you can sell off for $600-1000 depending on which they are. 482" stroker would be a little more fun than a 428. Just thinkin out load here. If your looking for something to burn money on and piss off the wife that's the way to go!!! Believe me!! But the prices the 428's are these days you can find a 427 for about the same money. Drive it with the 302 stroker till you have everything ready and then do the swap.