small block heads questions

thanks for the reply. I have these heads right now and cant afford anything else stroker kit is going to put a small dent in my wallet so im trying to work with what i have but i want to plan ahead for a later head swap . i plan on putting in 2.08in and port/polish [mild].had these j's on my old 340 and i hit 6500rpms with no prob.and it was still pulling.i know that bigger cubes need more air but can these heads work or they going to hurt