HEI Ignition gurus Help!

So I have a 70 dart with 360 magnum it runs fantastic with an 8 pin HEI. When I replaced my distributor with a new factory style I retimed the car and noticed when I revved the engine up to 3-3500 rpm it was advancing another 10 degrees. This is strange since I have a locked out distributor with an FBO plate.
Since I heard of other people having that 10 degree advance with an 8 pin, I figured I'd change to 4 pin.
Well i wired it up and it starts beautiful but wont rev over 1800 rpm. It breaks up like theres a rev limiter. It was a cheap 4 pin through Advance auto parts, part #CBE4. I tried another one because I thought I got a dud, but it does the same thing. I'll add pics of the diagram I used and of my setup.

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