Dave-
Sounds you have gotten yourself on the way to doing better than when you had the RX7.
I hope you get things sorted, and I am always available if you need set up data, or any parts upgrades your considering.
As for the gear, your on track. OPM has them for a 1000.00. Also need the LSD if you don't have that...
I do have some new pieces that can make the car handle better if your interested...
They are low buck (yea right...lol) upgrades for your suspension. We developed these new spherical bearings for use in the lower control arms, in place of the old polyurethane units...they work great, and the alignment holds better, less deflection under cornering loads too. They are 175 for a set of 2. They fit the 89-91 civic, crx, and integras, if you have 88 lca's on the rear, you will have to upgrade to the 89-91 style for these to fit. They press in the lca's just like a normal o.e. bushing would.
Also consider the front radius rod bearings as well. My car no longer "hunts" the road under braking...super stable and straight line now...they are spherical bearings as well...about 175 a set for those as well.
Those two bushings/bearing set ups will help your car stabilize and corner very well.
Let me know if I can help you further...
call me if you want- (866)438-3966
chris stiffler
Medina, Ohio
Street-N-Track Autosports