H farmall camshaft gear

How much play is acceptable between the camshaft and crankshaft gears on the H farmall? I pulled the timing cover off and the camshaft gear rotates slightly. Other than that limited movement everything looks like it in good shape. Is there a good way to measaure? I'll be honest I haven't dug too far into the books yet, but I figure it might be quicker finding the info here.
 
A good guess would be .003 to .006" the cam gear is subject to wear and were it mine, I would replace it with a 350 gear, and a 350 front cover.
These allow a live pump to be installed if desired.
and are steel gears. Much stronger. Jim
 

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