1978 full-time 4x4. Is a 700r4 worth it?

[cadillac_al]

On snow and black ice I like the full time all wheel drive without having to wonder if there is too much grip for 4WD. You can hardly make it go sideways if you try. On marginal roads you don't have to wonder if you should be in 2wd or 4wd; with a 203 you are always in AWD. I already wrecked posi trac vehicles in my younger days on black ice so I love my open axles and AWD over 2wd posi.

FWIW my brother has a new Toyota 4wd truck and that gets 15 mpg on the highway. I don't know how much we can realistically expect out of a square Chev.