Here's the 5.0 in the TBird. I still run the mechanical fan with a Cobra clutch. I like the reliability. Made a lot of mods to the cooling system once I put the A/C back in. I agree with the use of aluminum. It does help. Car doesn't have a grill, bottom feeder, so we built a all steel cowl hood to get the hot air out. I'm like you, I know zip about setting up a OHC motor.
I've never run E85. It would sure run cooler just a little hard on rubber parts like a carb. I had methyl alcohol injector on the 440 in the Roadrunner but only used it when racing. That and ram air worked good.
I stumbled across Archoil when I was looking into modifications to the lube oil system on some 4500hp water pumps we use out at Lake Meade. Initially I think it was made for lube problems with the 6.0 and 7.3 diesels. Injectors fire with 4000psi oil pressure and will cause built up shit in the injector spool valve. Causes the injectors to bind up. I use it in every oil change. Saves wear and tear. Anything you can do to reduce friction is a plus.
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