Hello Jared, and welcome to the party.
California98Civic posted this
super-handy table o' info about three years ago.
Now, you strike me as a guy who doesn't mind digging into his car. I see that what you have is a true mongrel, pulling bits and parts from hither and yon. That's cool.
This is a distinguishing characteristic of Honda Guys. Honda Guys swap engines as often as I change pants. I don't think I must be a true Honda Guy, but whatevs. Anyway, if you peek at that table you'll see the 88-91 CRX HF (first section of the table) had a taller final drive and an even longer overdrive. If it's possible to bolt that transmission to your engine (and now, over 20 years since it was offered, it may not be possible to find one, let alone bolt it on) would reduce your cruising RPM by about 20%.