What Im looking for is a stout high revving engine.
OK. This is the solution then. 400 block/3.25" stroke crank. This is the "350 Chevy should have built". It has a short stroke so it revs like a chainsaw. It has a big bore so it breathes easily. If you use a forged large journal 327 crank, it will be plenty stout. The cool factor is there. The parts availability is there. The ease of installation is there, and you have all the accessories/brackets/etc already.