Rpm 340 Cyl heads on a 318 !
You may get by without notching the bore with a 2.02 valve. Maybe. I always notched the bore, even with a 1.88 valve. It's one of those things you can actually learn with a flow bench. So I'd plan on notching the bore for a 2.02 valve and any bigger than that and you definitely need to notch the bore.
