That was a 12-A with lightened 84 asymmetrical rotors. A big "J" bridge port.

 

Weber 48 IDA with 36MM chokes.

 

Headers are 1 7/8" ID 24" headers medium long collector to 2 1/2" then a 24" Megaphone to 4" tail pipe to a Mazda competition muffler. Best power was 244.7HP at 9,400 RPM. That setup is gone now and the injected version of the same engine is around 270 HP. Ours was $14,000.00 years ago, Modern stuff is too rich for my blood. 

 

Lynn E. Hanover