This is the exact setup on my car. http://www.ebay.com/itm/NEW-INTAKE-MANIFOLD-NISSAN-SILVIA-S14-S15-SR20DET-SR20-/230851320397?hash=item35bfcf9a4d&item=230851320397&pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr ***
***** But the s13 version, no the s14
My manifold is a direct bolt on for sr20.
The IACV is welded SHUT ( I cracked my throttle open and my car idled a SOLID 900 rpm, that is no exaggeration, a perfect, no fluctuation, 900 RPM)
2 Of the ports are welded shut, so you have 2 1/8 NPT and 1 1/4 NPT
There is a bracket for a LOKAR throttle cable
I believe this is the throttle body you would need to buy if you bought my manifold
http://www.ebay.com/itm/100MM-Silver-Universal-Aluminum-Intake-Manifold-Throttle-Body-R32-R33-R34-Turbo-/330802300895?hash=item4d055a87df&item=330802300895&pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr
165 shipped for the manifold, spent a 100 on a 100mm throttle body, and you have yourself a good setup for the price.