Need help determine cause of missfire

One thing I forgot to add is ever since I got this crane cams hi-6 cd ignition box I have gone through a significant amount of pick up coils.
And one time the button under the coil wire inside the distributor cap melted away completely causing a terrible miss fire that I diagnosed very quickly as being the coil button inside the cap being burned away basically.
I bought a Mopar distributor from don at fbo systems and I had to replace the pick up coil 2-3 times with that distributor.
I’m wondering if it is the box that’s causing this issue.
Also a few months back in the summer time I held the throttle at 2500 where it starts missing and I could feel the ignition box getting fairly warm to the touch.
I have it mounted inside the cab behind the seat.
It almost feels like the rev limiter is kicking on and off at 2500 rpm and up like it’s just struggling to fire evenly.
I’m going to test the spark on cylinder 8 tonight by installing an old plug into number 8 and laying it on the valve cover and starting it and I’ll brong the rpm up to 2500 and see what the spark looks like.
I was getting a normal flash from the timing light on cylinder 8 at idle.
It wasn’t untill I brought the throttle up to around 2500 that I saw the break in the light.