Outer Limits 4x4 Board

Whats the best electronic ignition conversion for my 77 Rangie?? How much should I be paying for new leads, plugs, sensor and coils?
Is the Optospark the best??
Also 31 x 10R 15 muddies on 15 x 7 mags! How ill they go on my 2 1/2 inch lifted truck. Will they hit the guards????
Also will an 85 model boss kit for a steering wheel fit my 77??
MATT
Gold Coast

Hey,
I dunno about your ignition sorry but i can tell ya that i put a set of 31x15 BFG muddies on my rangie and they dont hit with some very minor inner guard modifications and i havent even got a lift kit..