Your first uncorked trip, to the muffler shop...
Many years ago, put the fresh 273 in the 66 with 360 exhaust man. Drove it to the custom exhaust shop down the main drag. I pushed in the clutch and shut it down and coasted up to the stop lights.When the lights turned green I'd fire it up and continue on. Turned out the custom shop wouldn't do it because they couldn't order dual exhaust for a 66 and said they couldn't bend the larger dia.360 pipe. I wasn't very happy with them but I got to drive it back home open exhaust