I have my 85 monte 350 running on a stock firebird Tbi unit. I'm going to upgrade it. I've bought both the Holley 502 Tbi unit and a rebuilt machined Tbi base with 46mm bores. I picked up the Holley first and then read bad reviews on it saying the injectors were bad. Before I decide to ditch the Holley I was wondering if anyone out there has any experience with it.