273 commando Build
FBO Ignition sells a limiting plate used in the distributor that allows you to set initial higher while limiting mechanical timing. You can always weld up the slots and file, but the plate is plug and play.
I ran one on my 273 and have one on my 5.9 Magnum. Both wanted lots of initial.
Here's the link. I emailed Don a question about using the plate in my 273 and he called me back to discuss. Unbelievable customer service.
FBO Ignition - Home of the HRR688