I have a DOHC in a zero, with bike carbs fitted
had to do a few tweeks to engine to fit it, but the zero chassis was standard
if you want to keep EFI, Redspec on here may have more info
moved altenator to below water pump
even with a shortened sump I lifted the engine so sump is level with floor,
so had to put bonnet bulge on as engine sticks through bonnet.(see pic)
some people have changed the flywheel as its v v heavy but i didnt bother
hope this helps
cheers Paul