88 ford racing MAF conversion

The MAP sensor becomes a BARO sensor. It is the same sensor with a different function. You cap the vacuum line that went to the MAP sensor and leave the sensor vented to the open air. It now senses barometric pressure and adjusts the fuel mixture accordingly. If you are on a mountain, it tells the computer to lean the mixture because there is lower barometric pressure (less dense air). If you are at the beach, it tells the computer to richen the mixture because there is higher barometric pressure (more dense air).