Try contacting UMSPORTS on here. He sells complete rebuild kits, or parts of it.
Cometic MLS gaskets are notorious for leaking on the KA, to solve this is get ARP head studs and torque them down to 80ftlbs not the 65ftlbs thats recommended.
Im running an intake manifold spacer gasket, my intake manifold is quite cooler to the touch than before, not sure if its helps but it gives you that piece of mind
Just run Clevite bearings, theyre fine. Theres no pistons rings you can put on to help the pistons because the ringlands are the weak point, not the rings themselves.
I used stock block KA @12psi on a S14 t28 on 91octane with Enthalpy ECU, S15 480cc injectors, FMIC and z32maf but the piston ring lands couldn't hold up to the Cali heat in the summer. 91 octane realllllly sucks. I really recommend going with atleast some pistons of somesort. $450 to save you a shit load of trouble later on.
I just ran at the track on a Gti-R t28 @12psi this past wednesday and I ran a
13.2@113 consistently. This is with bolt ons ofcourse also with no traction.