Be carful with those 340-360 heads, bigger combustion chambers = less compression. the 318-360 magnum heads, small combustion chamber- great ports & valve size, seem to be the way to go on the 318, remember you need torque. go with an edelbrock airgap int manifold, 600cfm edelbrock carb, a mopar perf cam for the stock 340, 1 5/8 headers with 2 1/4 size exhaust, a good ignition system, i prefer a msd 6al, at least a 3:55 rear gear. this should make a nice pkg.Longgone said