Yea, that dude died b4 17 years old. He got a pontiac cyl head to the back of the head. Apparently you shouldn't drive with engine parts in your car and hit a tree.. Not sure if he knew everything but who does at that age or ever.
Ported vacuum from my understanding is venturi signal based. So it should increase as velocity increases thru the carb. I've been running manifold connected on a low comp 440 and I customized the dist w stronger springs and a limiting plate for the weights and total cent adv. Works great. We experienced spark knock when connected to ported vacuum under heavy mid throttle acceleration. Thats when we made the corrective changes. What I like with the setup is that under quite heavy load we are solely operating on the weights / springs for the curve and then the limiting plate to stop the curve. When under light load we get more advance to compensate for the low compression (stock 74 440 with mild cam and setup) and low fuel / air load. Seems like a nice dynamic / adaptive / load based timing setup.
