DRive with a vacuum gauge taped to the windshield. That lets you know what cruise vacuum is. The vacuum cans are rated, and are avalible to match the driving conditions you have and ammount to correct the curve. Or use the crane adjustable one and that has a adjustment chart.
Mecahnical timing is rpm dependant. No chassis roller is needed.
Thge timing , reading, and plug addvice is spot on. Fbird knows.