Got a jet kit and increased the primary jets 6 sizes and it's running a lot better but still cutting out when the rpms get up around maybe 4000 or so. No tach, only guessing. Not sure what is causing it. Tried adjusting the timing and no change. Swapped to a small Edelbrock carb, no change.

Any ideas? Thinking maybe a sloppy timing set or plugs. I reused the double roller timing set. Didn't think it was very loose but I don't know. Plugs are auto lite 85 gapped to stock spec.