Have you thought about the 4.6 quad cam ford? If your not chasing easy power and not gonna be into racing competively go with a ford engine. 351 windsors out of the F100 are cheap in the states, and with the dollar at 96 it even better.
Merv can still go 351w as well if he wants with our emissions. But it's going to be much more expensive to find a compliant USA 351w engine than a 302w.