W2 valve size recommendations

I will add my opinion to that, and bear in mind I'm no expert... but like yellow rose pointed out the W2 was designed around a 340 cubic inch build, and on the stroker engines, I think you would have a hard time feeding one with anything LESS than a W2 unless you want to build a tractor engine. Kinda like its almost impossible to over carburete a small block mopar.