Just know you are on the edge of a mighty precipice. Once you start digging into the engine it may require more than you want to do. You never know what you'll find.
You've already been told it was 11:1, and I can honestly say that I've pulled apart dozens of 10.5:1 small block Chrysler's and not one of them was over 9.8, and that 9.8 was an engine that came in my car.
Beware the pitfalls of trying to piece something together. It sounded pretty good in the video. Maybe leave it alone until you are ready to pull it and fix it all at once. 10.5:1 on pump gas is pretty easy if you can do a little tuning and get your combo correct.
