is the manifold on the frst the same as one on an xr3i? and anyone know if any of the sensors that attach to it are different.

got a bit of a possible theory for my car not running right. its a converted rst from an xr3i using ofac and efi, i remember him on the phone mentioning where he got the block from but not the head or inlet etc. thinking maybe there is a difference in the manifold or one of the sensors is different. the wiring loom is ok if its not that then reckon it must be the ecu.