I'm running 300# front C/Os with the H&R Super Race conventional rears (260-300# progressive). With the PM3L/MM PHB rear, these rates ride pretty well and handle adequately for a 90% street driven car. But because the wheel rates are not that close (rear is too light), I try to make that up with a bigger rear bar (I'm running the MM adjustable with the .75" solid bar set on the lightest setting = a 94/95 GT bar). Since my primary concern is ride quality, I believe I have an acceptable compromise. But it IS a compromise. I don't think I'd want to go the rates recommended by MM, not because they won't work but my ride quality is right on the edge of not being comfortable for me on the street. My wheel rates are 270F; 140R average. Yours would be 293F; 248R assuming you accept and buy the recommeded set-up.