I would not look back. Build the 318 block with maybe the 3.58 stroker crank or 3.75. Bore only enough to get the bores straight and round with a modern finish. I would talk to TotalSeal about piston rings with the blower. Then select pistons for the ring width they recommend. 1/16" should be maximum these days. This will cost a bit more but you should get better results. Others on here can recommend the heads to look for. Intake valve size is not as big a concern on a supercharged engine as the exhaust valves and ports. You can give up intake valve area to increase the exhaust valve area to get the much larger volume of exhaust gases out.