Thank you very much for your input. I was planning on 11/32 valves, did you mean .001 oversized stems? I know the exhaust ports & bowls are really strong on these heads, same three angle grind and bowl treatment?
A radius under the seat works good with the r/t and 308 exhaust ports, but hard seats can make that difficult if the insert isnt ideal for such. With a j head type exhaust port you can just go straight up from the seat, as I do with these as well.