The 1g should bolt in where the 22r was just as easily as it does an 18R. The Hilux should be relatively easy. Can't comment on the landrover.
1g has a heap more low down power than an 18R has. I would guess the 22R ain't that impressive either. Don't forget that the hilux gearing is usually pretty low.
It would be heaps funny to hear a hilux take off with a 1G and big blow off valve. 4 sneezes before you hit 60km/h.