Heh heh, I second that motion. Seafoam works well for a general clean-out of the fuel system and upper combustion chambers, unlike other solvents it doesn't seem to ruin compression on old cars.
Do a search for the MAF adjustment mod, you can lean-out the air/fuel a little without worrying about detonation. Other than that, just do intake and exhaust...or a 3S-GTE swap.
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1990 5spd V6 Camry (Still kicking at 393,000km) 1991 Celica GTS -- Pappa needs a 3SGTE...and AWD for all this friggin' snow
Honda my A$$, you just can't kill a Yota...