Let's remember that we are dealing with just 6 volts. They worked fine when everything was new.
The battery cables should be huge. As big as your thumb like an arc welding cable. All contacts bright and shiney.
Spark plugs should be non resistor types and the spark plug wires should be copper wire, not the type used on todays cars. Plugs use a small gap. .022-.025 works well.
Have you adjusted the tappets to .015 when hot, just off the road, or .016-.017 if just warmed up. I am assuming the lifters are solid and not hydraulic. I think if a Dyna Flow is early production the first 5,000 units the lifters are adjustable, if after that they are hydraulic and subject to adjustments used on early hydraulics.
The battery is a long narrow one like used in a fork lift, and some farm units. It is mounted under the hood on the passenger side against the inner fender.
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