I think at the moment you are best port matching it to the head, use your gasket as a template, remember the head port should always be the same size or bigger than the inlets runner not the other way round.

Rob,

Ps its easy on an mfi with the head off.


Just put the injector plate on the head and match the ports, then put the injector plate on the manifold and match etcetc.

Its not so easy on an efi inlet because you don't have a sandwich plate.