I have a low mile 1970 302 that probably has too much compression to run that regular grade crappy gas we have to deal with but want to run it any way,it did have any pinging untill I put on a 4 bbl and it showed up and when I put on a duraspark electronic ignition its worse. The car has a set of shorty headers and 2 1/4 inch duals so its probably way too lean as the plugs are white and it looks like I will have to deal with the lean situation before I do anything else,it has a 625ish CFM AFB on it now but I know nothing about tuning them so I will be looking to get a holley 600 since I have plenty of extra jets. Would putting stronger advance springs keep the distributor from advancing too much as its setup for a smog motor with a EGR and mine does not have that junk,I need some advice on tuning it to run right and for the best gas mileage. Jeff