well got a stock 84 ramcharger 360 4 barrel auto. plugs in it now are champion . I think 3408 never heard of that but is what it is. anyone have good luck with a certain plug than others ?? getting ready for a tune up. do you think its worth the while to put headers on the truck for a little more HP / mileage. Ramcharger gets 10.9 lol someone put a 600 cfm elderbrock carb on it. got it dialed in at 21" vac.