In need of a new carby for a 1980 PE400. To my knowledge they came with VM36SS, same as the PE250, just with a different (2.0 vs 2.5) slide cutaway and a 6DH20 jet needle. I have found a new VM36SC for sale with a 2.5 slide, are they any different? Would this carby be compatible with a 6DH3 needle as it comes with a 6FJ6?