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Yes I no that , I work on my 69 Darts mechanic for 25 years ... Did you no some 69 dart 340 4 speed cars only had mechanical advance units made by Unilite Co.. Mark where ur distributors n rotors set at n pull the unit out take it apart n check to see the springs are not rusted or sticking...

Jet ur carb up 1 or 2 sizes is ur car a auto or 4 speed ? Your pinging because over heating or low octane or timing is to retarded I would much rather have the benefit of vacuum advance in auto or 4 speed , better fuel economy and starting .. Pull a plug out check heat range for that motor also...

No Magnum heads will work only on a 97 ram 318 .. 77 heads are aawjs 360 heads for 340..