The class is called under 1600s and in the class you are only aloud to use parts from the same make of car.I have been trying to get the a series bellhousing for the 63a box but are as rear as hens teeth so wil have to get this box made to fit.The engine is an a15 with twin dellortos extractors and uses methanol fuel.But the gap between 2 and 3 is a pain in the arse.