GnuVince
Throtle Body Injection.
It's one of GM's early atemps at fuel injection, It has in youre case two injectors directly above the throtle blades. There is also an I.A.C (idle air control) motor and a T.P.S (throtle position sensor) conected to the throtle shaft. I think the TBI is a verry dependible unit, but it wont in stock form deliver enough air into the system if u do any major motor mods.
I hope this helps U out.