Hybrid 75 RD 350 LC conversion

[84rzrider]

I am beginning the hunt for an LC top end for my 75RD350B. I have a good friend here in the states who has done a couple of these hybrids with very good results. He has good success running a Mercedes electric water pump and retaining the factory AC oiling system. Looking for std bore or a set with a few overbores left and a good cylinder head, ported is OK so long as it is rideable on the street on pump fuel. I can get a radiator and hoses here. I am told you have to run RD 400 pipes due to stud spacing. Have any of Y'All done this conversion. Is there anything other than the pipes and longer engine studs to be considered?
Thanks in advance...

[sispeed]

RD250 1A2 Pipes work also. All Pipes after 1976 should work and fit
Regards Siggi

[84rzrider]

Thanks. I was told also that the flanges can be slotted on the Moto Carrera chambers I have on the bike so they will bolt on...