why would it be a mess if you have a carb pickup that would be a dream then you dont have any wiring to match it will be all 1J basic stuff ou dont have any systems on the toy pickup that have to be integrated into the 1j wiring except for maybe coolant temp and speed sensor and tach . oh and byt he way 22RE means its fuel injected 22R is carb.

but its not that serious like everyone else said