water crossovers in mainifolds

on alot of after market manifolds for older carbd 302's, the intake manifolds don't have a rear water cross-over. there is debate as to if this is good or bad for cooling circulation. regardless, it does seem to cause more gunk build-up in the rear cooling passages of the head because the water just sits and doesn't circulate........just my opinion......but regardless.....do the efi and after market efi manifolds have rear water cross overs in them?????

another thing that happens is if you have a manifold with no rear cross over you need to put silicone on the manifold or the water over time will almost eat it's own cross over..lol.....
i see your installing power heads and a typhoon manifold....who and or what are the pwer head, like whats the valve specs on them and what do they run a pair? are those iron or aluminum? seems like i saw an add for them but i have so much 5.0 crap in my head right now i can't keep it all straight........please post back on how that manifold works and with those heads. from what i gather that manifold is an edlebrock knock off, but is it a knock off of the performer or a performer rpm??? do they give you a carb emissions legal sticker or number with that manifold??
i have been looking at those, i bought a victor jr knock off from that company for my 65 stang and near as i can tell the only real difference between their stuff and everyone elses is it;s made over sea's.......which i suppose would sway some to keep it as american as possible.......but a budget is a budget when building a car, atleast for a manifold anyway....