The least expensive would prolly be the Nutter by-pass (I don't know if those had a computer or not), combined with the Ford 300 ci distributor cap and rotor, and the MSD Blaster 3 coil.
Or, you can consider upgrading to a late model GM HEI distributor. I think you can pick those up for pretty cheap as well.
85 CJ7 Laredo Hard Top
33" BFG M/T
Moser One Piece Axles
D300, D30, AMC 20, 258 ci
Motorcraft 2100 swap
Custom front bumpers
Custom Rear bumper/tire carrier