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The problem could be totally independent of the bbk. Have you checked for strong spark? The coil connections? Changed the fuel filter?

So far it sounds like you are doing things correctly. For figuring the initial running problems, first start with the stock carb and different jets. Do you have the old exhaust on hand? If so, swap that in.

Do you have to dump the gas in the bowl each time you swap jets? Just making sure there is enough fuel.

Just to double check, you aligned the camshaft marks with the "T" right? Not the "F."

Agree, use 2 base gaskets. The issue comes with rtv when trying to apply it consistently, waiting for it to cure/dry, and then torquing correctly. The paper base gaskets with hylomar gives a really good seal and consistency. The metal gasket is for the head and nothing to change or add there.

Your pic is too small to see clearly. I use hylomar gasket dressing. I use it on car engines all the time where there is a paper gasket. Hylomar is also used on motorcycles. Spread a thin layer on both sides as excess gets smushed out. This is also great to use for running 2 base gaskets. Also, the metal gasket goes on top for the head.

The power surge isn't consistent because you are running into 2 things.
1. The limitations of the stock motor with stock camshaft
2. Too rich of a main jet will bog the the engine and when the spark plug can burn some of that fuel off, you get the rush.

Like in your last thread, I asked how is your spark plug looking? Have you done any plug chops? If you don't go through the #1 way we determine the correct range for main jets, then you are just going to be guessing. The best way to know what is going on inside your engine is to go inside.

What you need is a big bore kit and A9 camshaft. You have maxed out your engine and it would be a waste of time and money to try to push it more. Remember, we look for consistency and durability in power delivery. That's why we bolt on the big bore kits.

It can get tricky. Sometimes the extra fuel in a rich condition can wash out the carbon. Not saying that it is happening or not. I would try the higher main jet first before going to a leaner one. It gets even more tricky when you have a higher compression because the "sweet spot" for the air fuel mixture is tighter. The higher compression might even need a colder plug (not less spark, just better cooling via insulator)

Did you measure the piston ring gaps before installing?

I will say that I looked at the Hoca pistons and they have a cut out side piston skirt which is good for higher revving as there is less mass. The downside is more rocking in the cylinder, this leads to more wear. You might have to bump the idle speed higher with the Hoca piston and maybe even add that 2nd gasket if you have starting trouble with the regular battery.

Lastly, double check the timing (without the tensioner) and if it's possible to accidentally plug the enricher to a different plug, double check that.

I would bet it ran hot too. That pop shows it is running lean. If it was too rich, you would most likely experience a bog. Try a 92- main jet.

Have you checked your plug? I have a bbk and Uni. I use an MJ. Is your Uni filter oiled?