I keep seeing two things that don't go together: custom stroker and cheap. First off, I'd build a 408" 360 based motor. Spend the extra money on better cylinder heads. The few extra inches won't make up for better flowing heads. To put it in perspective, the shop I used to work at, we built a .030" 360 with mildly ported Edelbrock magnum heads. The cam was a hydraulic roller and this engine put out 497 hp. Never saw over 6200 rpm either. Now if it had had 400 inches and some real heads, well 600 shouldn't have been a problem. Even a good single plane might have put the peak number over 500 with a bit of a torque sacrifice. Obviously a cam to match, solid roller being my preference..