Color the lash cap with a Sharpie set the lash cap and set lash roll the engine over and look at the sweeping pattern.
The .050+ retainers will NOT effect the sweep pattern/rocker geometry, neither will push rod length.. But longer valves and lash caps can effect this. As long as its pretty much centered it will be ok, if it gets close to the edge it can and will wear guides and break parts in a hurry...
Hemi's are notorious for sub par rocker geometry so I checked it (like all my engines) Its a real pain to correct if its off with these Mopar's cause unlike Chevy's Push rod length change is all thats needed with brand X engine's.
Doesnt take long to check either...
Hope this helps.
On My Hemi the pattern started just inside the stem center and swept past center a hair past full lift... Mid lift was dead center.. Not perfect but close enough in my book.