Exhaust and intake on Slant 6

I have a 225 Mopar SLant 6 motor I am rebuilding on an engine stand in my garage. i am ready to roatte it upright since I am done with putting the oil pan gasket on. My next move is to put the exhaust and intake manifolds back on after they were painted/treated. What is the best approach to get these back on correctly? This motor has been easy to work with so far.