maybe the easiest way is to get a twin su gx manifold,then using that as the inlet runners,fabricate a large plenum to bolt to the runners.this was done by a friend with a supercharged 1200 ute(the one used as an example of 1200 versus 1000 front suspension).just making the plenum would be easier than also fabricating the runners.as for injectors,weld-in injector bosses are available from injection perfection,& should also be available from other sources.you could try using a ca20de manifold for bits & pieces,as these are very unloved,& should be cheap to buy.