It wont pass emissions, we've narrowed it down to a few things... the HC is high... what would cause that? Clogged cat?

Also, is there an o2 sensor/emissions computer in the 90' 22r's? (or is there supposed to be?)

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim