I run my B20z OBD1 and have used a chipped P28 running chrome, and now a Hondata S300.

Yes, when I dynoe'd at 143hp (stock) this was tuned (mildly). B20s respond well to tuning.

And yes you want to find yourself a low mileage B20Z which has the higher compression.

I used an ODBII LS manifold, just tapped and blocked off OBDII stuff that isn't needed; or just find an OBDI manifold. Doesn't matter.