You think 4.10s would help that much? I wouldn't think it'd make much of a difference. The 285s don't bother it at all, at least to me anyway. It came stock with 265s.
Never heard of the marine intake for it??? Though a nice 5.3L swap has crossed my mind. I'm sure there is tons of info on it around the interwebz. What would be needed, basically anyway? can I use the 4L60E that's in it now?