Ask a few questions to the manufacturers... whats the
primary length and the collector length... with the
cam I dont see it being a high reving engine so I wouldnt
bother with the step headers .... you will most likely
need a primary about 33" and a 3.750 dia collector
with it being about 17" long... these numbers should
be CLOSE .... if you want to PM me I can run the
engine through my header program