66 Dart wheel question, carb/iginition

I have a '66 Dart convertible that I bought a Wilwood disk brake conversion kit for and am having installed. The mech says that he doesn't think 15x7 American Racing Torq-Thrust II's will fit. I've searched some threads but couldn't find a conclusive answer. Anyone know? I am also looking for a cheap way to upgrade the rear end so I can run 4.5" bolt pattern all around (currently have the stock 7.25 rear end)...

Also my mech recommended installing an MSD ignition and new Edelbrock 500cfm carb. I'm not entirely convinced I need to do this. Running a '76 318 with '82 318 heads, marine 318 intake with a Carter AFB, and an aftermarket Mopar performance electronic ignition. Top end rebuild several years ago with dual exh, perf cam, double roller chain. The biggest problem is the Mopar performance air cleaner does not fit on the AFB, so it is only serving as an aesthetic upgrade and not doing much to filter anything. Any recommendations?

1966 Dodge Dart convertible, 318, 4 spd
http://www.forabodiesonly.com/mopar/showthread.php?t=68147

1967 Dodge Charger factory 440 Magnum car