Your rotor is out of phase just a bit.
Something is not correct with the vac advance whether you have it connected or not. If it’s connected the slot must be very large.
If it has a block off plate installed the pin is not located properly causing the rotor phasing to be off.
Several other things can contribute to this also.
I’ve seen cheap caps that had the locating lug for the distributor housing notch be so shallow that the cap won’t locate correctly on the housing and cause the phasing to be off but when you set timing with a light it ends up looking right at the balancer.
The large caps are more forgiving with this.
Very likely an incorrectly made cap. Not a Stansard ignition cap is it???
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