bigger rear disc in rear than front a problem I assume?

newguy said

I'll have to ask hemi denny, not sure on which kit, just started browsing and kind of surprised at the choices but seems like the only ones with four piston calipers are strange (non vented solid rotors) and wilwood, neither cheap. Seems like some of the wilwood also change track width

Just don't want to play musical wheels or brakes, too costly and I really want to keep the exterior pretty stockish looking

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I think you may have an issue with the cop wheels fitting over the Wilwood hub. The Wilwood hubs are mostly all larger than the ~2.7" center register those cop wheels will have. The Strange brakes are racing stuff, they're not for street cars.

If your car is going to be a street car with a "stockish" appearance, why do you specifically need 4 piston brakes? Number of pistons isn't everything. For example, the boring old single piston Mopar caliper for the 73+ cars, with its 2.75" piston, generates more clamp force than those wilwood calipers do. And certainly more than enough to stop any of the tires you'd be able to run up front on those cop wheels. I ran the later Mopar 11.75" rotors with 2.75" calipers on my Challenger with 275/40/17's up front, those brakes had no problems reeling in those modern compound 275's on that E-body. And that brake set up fits under a 15" wheel too.

Obviously you'd have to run something different with the MII spindles, but there are definitely more brake kits out there for those MII spindles than just Wilwood and Strange.