Those were numbers for master cylinders.
I dunno what Jeep did with boosters. I searched part numbers for your 84, an 88, my 93, and the new style 96 and all four Jeeps have different booster part numbers. Even more if you take into account ABS. I did all non-ABS boosters. The part number for the 88 that the guys on pirate4x4 used is (autozone number 54-74071 and is $70 with core added), (NAPA NBB 5474071 and is $94 with core added), and (Advance Auto 5474071 and is $69 with core). I can't figure out where this guy paid $25 for the MC and only $10 for the booster. Maybe when I searched for the booster it had more parts than needed included. I'd probably try using the E350 MC with whatever booster you already have. Who knows, maybe your brakes will be able to power those discs on that axle. I'd do the swap first then figure out if you need to bump up your brakes. I'll be running 1/2 ton Chevy calipers so I know I need to do a MC upgrade. I know some people have done a bigger MC with the 96 and later style boosters. It can be done. That might be overkill though.
