Do I need a kit?

1989 R1500 2WD Suburban 5.7 ltr V8 with throttle body.
 
Looking to rebuild the entire motor. Wanting to start on the throttle body first. Is there a all in one throttle body rebuild kit available with out piece mailing everything aside from the injectors and other hardware the may need replaced?
 
 

There is not a (full) rebuild kit available for the GM/Rochester throttle bodies that I have ever seen.

Normally these things will last the life of the motor, when it comes time to swap out motors you may want to replace the throttle body as well.
But......
Give your stock unit a good look over and if the throttle shaft isn't sloppy and the butterflies haven't worn grooves into the throttle bores then just throw a couple of new injectors in along with a gasket set and for less then $200 you should be about as good as new.

Thank you! Exactly what I needed to know!