I have an 87 f-150 2wd xlt lariat...auto. 302 efi...i have a 94 351 roller motor tha ti want to put in it...i want to convert to mass air....wha tharness do i buy tha tisnt like 500 bucks...is there anyway to make the mustang mass air conversion harness work with my factory harness thats already in my truck...do i need an a9l computer as well..... Any help would be greatly apreciated...