Here's a link of my Cruiser with a 6 cylinder we put in. 3 years of serious abuse and still running strong. This was last weekend on 7 mile in Colorado. This engine has a HP Cam, 120lb valve springs, Milled head, DUI distributer, and TBI from a Chevy 4.3.
YouTube - Coyote John pulls Ryan
What muffler? I have a 2pc header on my Man a Fre motor and I need to redo the exhaust.