Ive been doing quite a bit of research but most I come across is converting a 5.0 SD to mass air not a 5.8W SD to mass air.Im unclear if a 5.0 mustang mass air computer like the A9L will work with the 5.8. Due to the firing order being different.Im not ready to install a H.O. roller cam yet which would give it the proper order. http://fordfuelinjection.com/?p=92 I was reading this and it says not to move inj. plugs around.Please any help would be highly appreciated.Which computer would you recommend for 5.8 with C-6 trans.Did some more checking it appears the 5.8 has the same firing order as a 1989-1990 5.0 gt mustang.My motor is a 97 f250 roller motor.Could someone confirm that for me that knows more about ford engines.