Welcome aboard Nick.
I'm such a perfectionist, the engines I have built have taken too long. lol

I would be looking around for a factory competition manual.
Sometimes you can get them over the counter at the dealer.
Sometimes over the internet.

Ford, Chevy and others put them out because they want people racing their cars to do well.
When I autocrossed, Nissan/Datsun not only put out the factory competition manual, but competition parts could be bought through the dealer. I still have that book. They even told you the best "stock" parts to use.
The suspension stuff was the best at the time.

Check Peterson Publishing for competition books.
Go to the import drags and see what guys who actually race are doing with their engines.

You might check out machine shops and see what thoughts they have as to what the specs should be.
I would get everything balanced, as a way of making everything rev better and run smoother.

If you are looking for a shop, John Wilson and LHT in St Pete is a place that I would trust.
You might see who he recommends for the machine work.

A friend took his engine to United Speed World north of Fowler on Florida or Nebraska Ave.
They ported and matched gaskets (that I know about) and maybe other stuff).