Distributor Problems

[El Jay]

Here's the background: When I bought my '69 it had an Accel distributor. I don't remember what the problem with the distributor was, but I swapped it out for a complete MSD system; spark box, distributor, Blaster coil, plug wires; firing Accel shorty plugs.

My problem is, about every 4 months, or so, the carbon button in the distributor cap is burned up so I have to replace the cap & rotor; which is getting expensive.

So far, nobody has been able to give me any reason why this is happening.
I e-mailed MSD tech support & they said it may take up to 48 hours to get back to me. It's been over a week & still no response.

Doing a little research, I've learned that the spark plugs (when doing a tune up, I just replaced "like & kind") I'm using are non-resistor plugs.
Could this be the cause of my problems?

Any input at all would be greatly appreciated.
Thanx,
LJ