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I'm doing the same as I write. Rebuilt 302 motor at .030 over. w/ Sig Eeson 30-30 Solid grind w Full roller 1.6 rockers.

I plan on geting cam off ramps via CRG checking/setting clearance procedure. When I did this Cold w original rockers  (.026) it would check .030 when hot afterwards.  Motor seemed to run better there all around.  With new cam I'm going to start at .030 and see where the (Al) ones end up hot. If I need to adjust +/- i will an check again and adjust afterwards after I change to both spring and dampner spring after initial break in.

thanks for the help maybe someone else will have the pressure that I need to use.

I'm going to guess on HVLP   Start w 2.0 Tip  16-18 lbs Air at Gun (Not Tip)

Paint ?  Read TDS for product spraying info, If nothing determine product type 1K or Solvent based.
mix accordingly, if no info start at 1:1 and I would then start removing reducer to thicken test sprays

or try to lessen Air Pressure.   Practice on a file cabinet or old inner fender to get spray technique