New Standard T-Series ignition module.  This sits inside the distributor.  This is a stock replacement module, for computer controlled HEI distributors with the 7-pin module.   Fits the following:

80-86 Firebird/Trans Am w/ 301/301 Turbo Pontiac, 305/350 Chevrolet Engines, V6 Engine
81-86 Camaro w/ 305/350 Chevrolet engines, V6 engine
81-91 Corvette w/ 305/350 Chevrolet engines

NOTE : Please ensure you are ordering the correct part and diagnosing your problem correctly. Opened/installed electrics are not returnable.