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Dana has calculators and design guides to help you though the design process.
https://www.danaaftermarket.com/calc...Calculator/202
https://www.dana.com/globalassets/re...guidelines.pdf
A digital level is best to use, I have one similar to this:
https://www.homedepot.com/p/Swanson-...E&gclsrc=aw.ds
And remember you can always measure surfaces 90 degrees to the crankshaft center line (front or rear face of block) and do the math.