If you know the thickness of standard ones, you can dummy build using the ones originally fitted and work out the difference. Then you can calculate what the float will be with standard new ones and go from there. However, that relies on some very accurate measuring and for the cost it is best to fit brand new standard ones, then measure the end float with DTI and correct with +003" or 2 x .003" in order to get it right.
If the crank has had to be faced on the thrust faces it can be necessary to get the +0.030" thrusts and machine them down to suit. I had to do this on an engine which 'picked-up' when being started in really cold weather with the clutch pushed down. The clutch load on the bearings before the oil flowed caused the problem. The size I ended up with was +0.003" on the timing chain end and +0.012" on the clutch side.