Coil selection advice

[Walts50]

I have an 8BA, Mallory dual point 6V positive ground. Coil is just black no name.

After cleaning and replacing some contacts car is again starting OK.

But I noticed the coil is apparently wired backwards with (-) coil to the distributor points.

Reading previous posts says it will still work but not as good. Also that the coil gets shaped by this so you can't fix it by just switching the wiring.

Does this make sense?

Any suggestions on what to buy for a new coil