If I got a built motor and used DOHC heads could I use the GT computer or do I have to get a cobra computer. Also could I use the GT wiring harness and just swap the computers. Or do I have to replace the entire engine wiring harness and computer... Thanks.

 

You need the computer and wiring harness unless you splice certain connectors into the gt harness i saw a webpage that explained it somewhere but seemed like too much for me. Also the cooling system is different too, if you go to shm they have a picture of the diff coolant hoses and all.