Timing
Here is what I like to do.
SET timing around 10 degrees
While idling 20-25(where vacuum can helps)
Cruising 40-48(also with vacuum can)
Under load (naturally asp) 34-36
Under boost (subtract 1 degree per PSI)This good for lower amounts of boost , like 5-8 lbs. It depends a bunch on your fuel , cam and compression.
I have no muffler on the 65 ELCO with turbo 292. I like the sound it makes. Not excitingly loud. Used 3" pipe all the way. The down pipe was configured from old Ford powerstroke downpipes to get nice mandrel bends. Throw aways at the exhaust shops from guy's converting to larger downpipes.
