what kind of headgasket was the head replaced with? there are alot of crappy ones that could easily fail after short mileage again. if it were me, id just yank the motor, and get an EB rebuild kit for 300 bux to make it new again. check the head out and see if it is up to spec. if it was rebuilt its probably fine. you could spend 500 bux and a weekend, and in return get 100000 miles from it.

87 4runner 33" bfg mt's no lift. dubbed the marine by my frinds. dead as of august 14 2005. 84 ex cab p/u 33"a/t, 3" suspension+3"bodylift, thorley header and 2.25xhaust, downey midrange cam+rocker set, very milled head! NO RUST!