Had a gtx4202r on and it fit fine. Went to put on a 468 on and I can't get it past the head or intake plenum. I've ground on the bottom of the compressor housing outlet and removed some extra material, but I still can't get it. I have tried mounting the exhaust housing then center section and comp housing. Also tried sitting the center section and comp housing in assembled with no luck. I have to mount exhaust housing separate so that I can get waste gate piping connected. What the hell am I missing?