on a mustang they're the epitome of grace and comfy ride when set up properly. The MM stuff is pimpin. FWIW, I have one of the most aggressive setups you can put on the street and it's firm but not too harsh.
The plan you put up there would be a good way to go if a little more expensive in the long run. I did basically that same thing and I wished after the coil over conversion that I'd never wasted money on regular springs. In your case, you'll probably like B springs better than C springs. C's ride pretty rough for my taste.
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