New spark plugs are a must for any good tune-up. Replace and check for abnormal pitting or charred plug ends. Always remember to check the gap on new plugs, it has been our experience that factory settings may not be correct.
Over time, ignition wires build up resistance, eventually causing them to restrict voltage, causing poor performance. Re-wire those old crusty wires with our new set.
This unit from Crane replaces the points in your 356's distributor, you never have to adjust them again! It also increases power and fuel economy. Crane FIREBALL XR700 Conversion Kit Changes Std. Point-Type Distributor to High Output, Optically Triggered Electronic Ignition