Timing Curve

Mattax said
All I can say is try it.
I think you know my opinion, but in case not, I'll repeat. LOL
The new timing from 1800 rpm to 2500 may result in pinging during part throttle acceleration and uphills.

You now know how to change it, so you can experiment. No harm, no foul. Just back off the throttle if it starts to detonate under heavy load - that's when there can be serious harm.:eek:

I forget if the OP has a stick or torque converter but with that curve care needs to be taken to not lug to hard on the engine, especially with vacuum advance. And I'd try to get the VA in shape and working if you can. Maybe bring it in pretty late and maybe take a bit out of it. Any extra timing you can get at cruise will help MPG as long as it doesn't rattle it to death.