That motor lives here now..all 670 cc's.   It was disassembled, changes made to spacer plates, port timings, head volume/compression,...and  the O-ring grooves had to be recut to proper size to eliminate blowing out when you nail it.
The twin carb set-up wouldn't work in this chassis and were replaced by a single Cutler 48 x 58.5 oval bore carb.

Its for sale.....................$7500.00...........No tire kickers and No free rides.