Really good replies, thanks to everyone.,
I only have one water pump, a FlowKooler.
https://www.summitracing.com/parts/BRA-1671
I took the front 1100 CFM pusher fan off. Now only 1300 Mishimoto twin puller fans (2600 CFM total) on. Carb mix screws 1 1/2 turns out, it came new out of the box at 2 1/2 turns out. Edelbrock said that's about right. No vacuum leaks anywhere. It starts bleeding coolant from rad to overflow tank when super hot. 19lb rad cap. Electric choke working fine.
So, my son-in-law came over and got me to stop wanting 800 RPM at idle just because it feels smoother. He said I've got to live with the slight rumble from that cam. Now it idles at about 1200 in park, and 550 in gear at a stop. Still too much of a drop and not sure why.
Motor nearly overheats at a stop but much better than deep red on the gauge needle.
I've ordered two of Derale's 2100 CFM 14" fans (4200 total)
https://www.summitracing.com/parts/DER-18214
with their 16795 PWM Fan Controller
https://www.summitracing.com/parts/der-16795
They should fit my Mishimoto fan shroud perfectly and give me a tight seal.
I'll let you know if it fixes the overheat. I don't like it when guys ask for help, get lots of answers, but never tell you what actually worked. You, too? Ha!