Why can't you just set the head/pushrod/roller lifter up as normal, turn the motor over by hand and then measure the clay? Then, maybe subtract a little from your measurements to account for 'pump-up' to be safe with your clearances.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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