With what Dave pointed out if you decide to go with a speed density setup your options are the 1227730 and 1227727 ecu. Both work the same but the 7730 is not weatherproof so it has to go inside your cabin. The upsides for it are they are more plentiful coming from an F-body and all the write-ups are on that ecu making it easier to chase pin-outs and the such. The 7727 is in the 90-91 L98 corvettes only (to me knowledge) and are usually harder to source for cheap with a memcal. FWIW a good MAF system is more forgiving to variations in the engine like cam timing or replacing parts as they directly measure the airflow coming in but the speed density systems tend to be easier to setup initially to my understanding. Best of luck