David, I like the way you think. I'm an engine guy myself, and I'm constantly reading and researching whats out there. I feel that this conversation won't go far on this forum, due to the stupid LS platform being so efficient, and the engineers doing there homework so well, that honestly it's a no brainier for the average guy building a car to choose an LS3, or Ls7 for their project.
My Chevelle, when I bought it had a fresh .030 over 350 with a 350 trans, that worked well, but I wanted to drive this car a lot, so the fuel injection and reliability of the LS series engine was calling my name. Yeah it's mainstream today, but I wanted reliability that an old sbc couldn't give me. Been there done that.
In my younger days, I worked at a shop that built Cup engines, back when people actually outsourced objects in Nascar. Not only did we build engines there, but we raced on the weekends. I was able to learn engine formulas and machine work during the week, and then on the weekend apply what I'd learned. It was a great job for a gearhead like myself.
Later on in life, when funds started to get comfortable, I did my own racing venture, running asphalt late models. I built my own stuff, due to what I'd learned from life's experiences. Absolutely priceless. The engine program that I had to run was perfect for this thread. A lot of homework, trial and error, and money went in to making those engines run. But that was racing.
Not to bust your bubble, but the 4" crank you want to run in your LC9 will increase piston speed, and even with long rods, your piston speed will likely be greater than stock. That block will bore out safely over .100, however.
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