Coolant - standard "old fashioned" green ethylene glycol
Transmission - 90 weight mineral oil per Chevrolet shop manual (available from Tractor Supply listed as Ford Tractor Transmission Fluid)
Steering Box - John Deere Cornhead Grease
Engine - I use 20w -50 motor oil in my unrestored 216. If you're worried about the lack of ZDDP in modern oils, use this 15w-40 oil developed by the Classic Car Club of America with 1600ppm ZDDP specifically for flat tappet engines
https://inrccca.org/product/classic-car-motor-oil/Brake Fluid - DOT 3