Will they work with a TPI setup? I mean will they plug into the harness and also fit in the intake manifold?

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91 Z28
Come see The Vicious...

 

I'm pretty sure they would fit into the intake injector seats just fine, but I don't think that the ECM in your car is ment to work with those injectors, I am sure there are some minor differeces in them, I don't know what they are, but it would surprize me if there weren't some differences in them.

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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 with 2.77:1 Gears.

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET: 14.32 @ 97.7mph
(corrected for elevation)

 

LT1 injectors work just fine. However, they are rated at a higher flow. 24lbs vs 19lbs (305) or 22lbs(350).