The Ramcharger MC is a 1.125" bore unit with 1/2-20 and 9/16-18 inverted flare outlet ports, cast aluminum body and shared plastic reservoir with screw-on caps. There are similar variants of that Mopar MC in 1.06", .94" and .88" bore sizes that I know about (different outlet port sizes on some), and probably others as well.
There seems to be some confusion as to what a "Camper Special" unit actually is...at least on my end. If I'm not mistaken, the manual/power brake unit from the F250 with single-piston calipers is a 1" bore and would therefore match the 76-77 EB unit in terms of bore size and performance, making it the better choice. The power brake F250 unit for 2-piston calipers has a 1.25" bore size and I think was only supplied in power configurations, way too big for stock Ford or Chevy single-piston caliper setups IMHO unless you're running hydroboost or correspondingly large vacuum booster and have the gain to push it.
Reservoir size can indicate whether the MC was designed for disc or drum, however is not definitive and has little to nothing to do with how the hydraulics actually perform since the added volume in a disc application (versus a drum application) is just there to account for pad wear over time. Bore size is what determines the pressure output for a given input force at the pedal while stroke is determined by the volumetric requirements of the calipers and pedal ratio.