Been searching for awhile. There has to be a thread on this...
Getting close to starting the 400 stroker up for the first time in 20 years...researching everything.
At this point I'm leaning toward just plain green 50/50 antifreeze. Seems to be a bunch of internet suggestions in many different directions.

I came across Valvoline max Life antifreeze (its yellow) but that seems to be commercial. Not in any store-would have to order/ship it...

This motor is all new inside and out. I guess technically the whole car is new inside and out at this point!