Budget 318 build

Ok so I have been fortunate enough to have found a rearend with better than 276 years 373s to be exact and I came up with a little extra money for my build so im seriously considering taking you all's advise and rebuilding the bottom end. And milling my 360 heads and using them. Starting with the bottom. I know i know how to get my compression height number take the stroke 3.31 divide by to and the rod length 6.123 which puts me at 7.778 then subtract the deck height. That's where im stuck how do I find the deck height iv read alot and it says that 318s are like 9.6 but they can vary how do I measure to find this out? Ok and what i the stock 318 compression height? I found some kbs that are 1.741 how does that compare with stock and how much differnce in compression will that make without machining the deck height down to 0?