Without going through the whole thread again, are you running a 19.5" flex fan or 19.5" 7-blade clutch fan?

Also, there were several tests done by HPP magazine a while back, where they tested 4-core stock copper/brass rads against some high end alum rads. In ALL tests, the stock rad out performed the alum rads over and over again. I wouldn't count on an alum rad solving your problems it didn't do a thing for me. Also, opening the scoops on the hood will do little to nothing for hot issues.

Do you have ALL the fillers up top, fender gussetts, 400 X-fillers, masticated rubber fillers in front of core support on each side, lower baffle etc.? Without ANY of the above mentioned pieces, you are going to have issues. Each one on their own will not solve Hot issues, but ALL combined will.

All of these filler panels, baffles etc. are designed to force the air coming in through the grills THROUGH the rad. Not under it, around it, over it etc. You want ALL air directed and forced through the rad. Air, like most anything else will take the path of least resistance. That's why typically, if you have a "hot" issue when sitting still, you have a water flow (ie: water pump, pulley size, wrong/bad thermostat etc.) or fan issue (too small, not enough blades, bad clutch). If you have a "hot" issue when the car is moving, you have a air flow issue/problem (meaning you are missing some of the pieces designed to force air through the rad. ie: lower baffle, 400 fillers etc.).