Timing help for '64 Dart, 225 CI

You are getting many answers as for "how to do it right". And they are not all completely correct, so I'll not confuse you any more. The only thing I will contribute is to skip the 91 octane, and stick with 87 octane. The only thing 91 oct will do is lighten your wallet. A stock slant six will only have a CR of approx 8-1. With 91 oct, you would probably never get it to ping, if you could get it started. The octane rating of the fuel has nothing to do with the lack of lead. Lead was added to gasoline back in the "old" days to increase the octane rating, but a stock slant six does not need any octane improvers. Now you can listen to many varying "cures" for your problem.