I have a 68 Formula S 383 car making about 400 hp. 22 in factory 3 core rad, no shroud, stays cool no problem. Super Stock 68 Darts and Barracudas making 500 hp used the same radiator. Just have your radiator rebuilt with a 3 row core, if you need to. No extra work, no figuring out what hoses to use, no aluminum Chinese radiators. My blocks are machined with torque plates and mains torqued. I use premium rings. They always spin easy and run cool. Most problems sound like not enough air flow at low speed to me. I also don't see the need to build a stroker, there are plenty of guys running into the 10's with a 360, or a 340. Why spend all that extra money?
