Pinging

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 see if its orange or clean .. I own a 69 GTS 340 X heads stock manifolds eddy 650 AFB its a screamer Orange box ECU IGN .. I run on 89 Octane on highway to work ...