I am thinking about either changing my engine or rebuilding the 256ci six cylinder (4.2L) in my CJ. Do you know of anyone changing the 4.2 head to a 4.0 HO head and adding MPI injection or is this old school? Or are most people changing out the 4.2L engine putting in a newer 4.0 OBDI or II? I like the idea of changing the head and adding MPI (might be a little more $$ but easier). Any comments on this?

78 CJ7, 83 wide track axles/Dana 30 Front W/ OX Locker, Model 20 rear w/ one piece shafts(welded tubes)/Detroit Locker, 4.10 gears. 4.5" spring lift with 3/4" shackle lift. 35x12.50 BFG MT, 4.2L, Weber Carb, K&N, T18,Scout Dana 300,Warn 9.5ti