360 la headers & straight pipe

340six said
Your low PO 360 from truck van won't be that cool with no muffs
Be loud but not like a HP with compression and cam.
And the needs muffs for backpressure was covered on Engine Masters.
Headers with extensions was best. The formula was, painted a pipe and someplace at 16 to18 or 19 inches the paint burned off. That's where to end the pipe coming off the collectors
I think I would grab a bolt on from Summit set up if on the cheap. Or Pypes , or Flowmaster of ya like drone for street use.

Engine Masters also disproved the burned paint mark test. Each dyno pull they did, the paint just burned farther up the collector extension until eventually the entire mark was burned.

Collector extension (or same-diameter pipe as collectors with full exhaust) needs to be at least 18" long and generally the longer they are the farther down in RPM the torque is retained.