360 build, hp and compression thoughts!

I'm going to guess it's a little lower than 9.5:1. Which is not a problem. That's why you have 150psi and can run the two light silvers. You might want to try this tho: replace one light silver with one blue, replace the black bushing with blue, and reset the initial to 17. Then re-tune the carb. Reson being your carb is a little small (IMO) and you don't need all that advance so early. Over advancing down low on pump fuel can be a problem because it burns so quickly compared to non-oxygenated, non-ethanol-added fuels.
As far as your questions - I think it's around 9:1 and the horsepower is probably 325ish. Not too shabby - but a track visit will tell you more.