Technical Arcing from coil

Hello gents was wondering if someone could give me a little help I have a small block Chevy with an external coil I changed the plugs and wires recently and upon startup I noticed that

The coil was arcing from both the positive and negative side any suggestions on what can be causing this

My thought process is

First double check all the electrical connections to make sure they're correct which I did

change out the coil for a new one

I'm thinking an extra ground strap could not help currently there's only one on the vehicle

And that is the extent of what I can think of any suggestions would be appreciated thanks

 

Open high tension coil wire. If it arcs a long time it will carbon track the coil tower.

 

That coil wire boot looks loose (too big)? Coil being wet on top. Is it just moister or is the coil cracked?

 

That coil looks pretty dirty and oily. I suggest a complete physical cleaning of the ignition system.

 

Dirty coil, cracked, and poor fitting boot. I'd swap in a new coil, and bet it fixes the issues.

 

I'll give it a shot right away I did notice the new coil wire has a cap that is significantly smaller than the last one I'm going to grab the old cap out of the trash put it on and see if that makes a difference

 

I carry high voltage putty in my travel kit....
https://www.amazon.com/dp/B00DECQFFK/?tag=atomicindus08-20
might get a better idea of exactly where it is arcing looking at it in the dark

 

Three people said the same thing I thought even before I saw the photo. DIRT AND MOISTURE plus a possible crack.

Step one, take the coil out and clean it up so it is clean and dry and inspect it closer for a crack.

 

Thank you to Tubman and all the other replies so I took some brake clean and a rag voila I found the issue thanks again for the help guys

 

Select full image