Deck height

Ok so can someone walk me thru the steps to finding where my compression is going to be at with this engine.

I can get the required measurements just need to know specifically what they all are thats needed.

I like the write-up above posted by Crazycuda but since my engine is still in the vehicle and is slanted I dont see how I am going to be able to get an accurate measurement of fluid.

I measured the bore and it is stock, as far as what I have read stock bore is 3.40. For some reason this one comes under that at 3.95 or so.

I can get the piston deck height in the A.M and I am confident I can CC the chambers on the head.

As far as I know that is all that is needed. Once I have these figures what can I do with them?

I understand there are on-line calculators but Id like to figure it the old fashioned way and understand my work.

I have been told with the way fuel is going that I will not want to shave the head any more than is necessary to attain a 9.1 ratio.

Now that I think about it if I decide to use the larger valves I have purchased isnt that going to change the volume of the chamber in the head.

Do I need to do this head work before I can decide how much to take off the head to increase compression?

I dont just want to remove a 100thou and hope for the best. Id like to know what and why things are being done.