The green plug w/cap from the coil is your rpm output.

How is your truck smog'd, Fed or CA? IIRC, only CA smog'd 22r's had the O2 sensor on the exhaust manifold, yours may not need one.

What were the smog numbers? The more info you post up, the better chance we have to help you.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed