In stock form the F22A6 (PT3) head is slightly below the F23A1 in terms of flow. The weak point of the stock PT3 head is the exhaust ports. They can usually be hogged out pretty wild before you get past the point of diminishing returns. As the owner of way too many CB7s, I'm quite a fan of the PT3 head. My recommendation for that head would be to port the exhaust openings to match the diameter of an aftermarket header, staying off the port floor. This, paired with a bump in compression from either milling the head .030" or from K20A2 pistons would really wake the F23 up.
Your issues with this setup would lie in sensors and tuning. You would need to run either an F22A6 or H23A1 intake manifold lower runner. You would then have to pair this with a plenum from an automatic F20B or H23A VTEC (I'll be selling one shortly). This is necessary to run your stock 3-wire IACV. The IAT sensor is different, but that's nothing a simple clip and resolder couldn't fix. They read the same values. You could reuse your OEM distributor and camshaft gear. Then you have to find an ECU to run the thing. Either full stand alone or a jumper to run an OBD1 ECU, with all of the other hassles that brings.