The lump port conversion to the 230 cylinder head (same as a 292) frees up the laminar flow enough to overcome a lot of restriction and turbulence. A roller cam, a rev kit, and some extensive valve work and pocket porting, followed by flow testing for equalizing pressure rise/drop for each port, followed by dyno testing for final mixture and ignition timing tuning is obviously going to be necessary. The small port adapters needed to mate the side draft carbs to the intake ports are extremely simple to make and flow test. They should be no more than 3 inches in length, probably less, with NO turns- - - -just a straight passageway from the throttle plates to the ports. A simple water manometer, a shop vac to provide airflow, and a few functioning brain cells can yield a lot of useful information about port flow rates. Then it's on to the dyno.
Making a 235 head and manifold flow better is about as likely as finding a chicken with lips!
Jerry
