13.3's to 11.8's to Forget it...

I'm going to change the 4 components (heads, cam, converter, gears) and see what I can get.

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I’m on board with all that.
Real heads
Real cam
Real converter
Real gears
Plus the other stuff you already own....... should be able to yield an “11”.
I just don’t see those items being something like a 484 cam, 11” converter, bowl ported 1.88 valve la heads and 3.23’s....... if you’re serious about the ET.

I like that you do it your own way...... so I’ll keep an eye on your progress and see how it works out.