dave two options fella ,
if your having it rebuilt , have the cases blasted and powdercoated before reassembly ,
or once its all back together , clean , degrease and paint in 2k , just mask of the flanges ,
frost restoration do a really good paint called aluma-blast , its a alloy effect paint , very durable used it to paint cylinder heads , inlets ect ,
comes in both tin and areosol ,
http://www.frost.co.uk/item_Detail.a...ductName=Aluma Blast (340g) Aerosol
hope this helps fella ,
beef