I am putting a 4AGTE RWD engine together from 4agze FWD engine. I am planning to use the 4AGZE head (I think engine is Mk 2 or 3)so it seems the head is small port. From what i understand the the only bolt on manifold is the the RWD 4age 86kW. Is this true and is there any alternative? What principals are to be used on making an inlet manifold?