only reason i am doing a SAS on my 94 is that I have all the stuff (suspension, axles etc) from my 81. Doing it on a tight budget, saves me $$$ on gears etc
That being said I would go Long Travel up front if money was not so tight.
axle ID
Toyota Mini Truck Front Axle Identification
79-80 no gusset
81-83 short gusset (to u-bolts)
84-85 long gusset (past u-bolts)
As far as swapping the oil pan for high steer, just go that route, no sense re-inventing the wheel. Converting to High steer was the best upgrade I ever did on my 81.
for your front spring hanger- if you go with a Trail-Gear style hanger- that automatically adds 1.5" or so to your lift. Consider a low profile hanger such as the one Low Range Off road sells
After using the T-G hanger on my 1st build I am going with the Low Range Hanger. It will be about 3/4"-1" lower than the T-G
I would keep it IFS and just beef it