Looks like the guy is a dealer for A &amp; I parts. Now just for fun, are you thinking of this for a winter project? Take the head off and do some work on the ports. Up the compression to that of a 770 (same basic head) then get your self a pin vice and some numbered drills and jet your carburetor to the same as a 770, Also are you good with a welder? Cut your old intake in 2 pieces and polish the insides, round the ports, etc. It will wake up the Super 77. Have you checked your  high idle no load speed yet? What transmission code do you have? More cash in your pocket, open the ports on the intakes and use 550 sized valves.