I have a 91 rs with a 305. Mods include long tube headers straight back to a Flowmaster 80, I have a Edelbrock performer intake and a lt4 hot cam. 492/492 lift.
car runs strong just not sure if she’s at her full potential

 

I am surprised your car runs at all. You are in desperate need of chip tuning. You likely won't find a shop and will have to invest your time into DIY tuning. Luckily, all the info you need is on this website.

 

If you sticking with the stock ecm you will need to datalog.
Tuner pro rt is a great program to use. You also need a aldl to usb cable like moates.net xtreme aldl. It would be a good idea to convert to the newer flash proms instead of 2732 proms.
or look at dynamic efi ecm.

http://www.moates.net/g2-memory-adap....html?cPath=64

http://www.dynamicefi.com/

 

Ok sounds good. I know I’ve read a lot into building up a engine and having to get a new chip because the car runs like crap but mine as of right now runs strong and healthy, breathes 100% better and it shows. But I wasn’t sure if my car has more to offer with a good tune. I’m not big on computers so it’s going to be a new adventure getting everything together for logging and tuning.