Vacuum/Mechanical Advance Dilemma SB340

With it being so ping happy, check your plugs. No iridium, platinum, or unobtanium. Champion copper plus truck plugs one step colder, maybe two steps colder. You got race gas available? If the engine is cammed that much, plan on trading the 3.55s in on 3.91-4.10 gears. I stand with RRR on 3.55s usually being more of a halfway compromise instead of a viable gearset in a real performance build. Great for a lot of stock stuff, but when you have something that doesn’t turn on until 3000 rpm not so much.