Ok, so here is the deal. I am new to the whole ecm/prom thing, but I've been doing a lot of reading. I am doing a 305-350 swap in my 89 Iroc TPI. Just a plain jane rebuilt stock 350. I know I need to swap injectors and the prom. My issue is that I do not understand what prom I need to get. I know I need a prom out of a 350 TPI, but I'm sure its more specific. I'm sure this is a simple question for you guys out there. But I have someone who is offering to sell a whole ECM out of a 91 Z28 (won't sell just the prom) and I was wondering if that will work for me or not. Thanks a bunch! Sorry for being a n00b.