I use that GB 44K fuel system treatment and it seems to work great, but any other suggestions? Also, what other chemicals can I run through the car to get it running its best?

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

 

In my experience the best internal engine cleaner is a good tune, good working computer , and a good highway drive.
As an anecdote, the 350 in my 85 was severly carboned up at one point from driving for a long time with a shot tps (which w/ CCCS easily goes undetetced.) Once i got it runnning right again, and with all teh highway driving i did, the inside of that thing was pristine.
...ed