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I have never had any issues with as little as .035 but I like to use.050 as a rule of thumb.
You are using the 227 cc heads ? Should be a lot more the 372 you had.
Take your calipers and find a...

He could run a 3.875 crank in that block without all the clearance issues with the right rods. You wouldnt even notice the 13 cubic inches you give up and it is way easier.
Like JustAddDirt said...

Using a 4" crank in std. height block. I have talked to guys that have been lucky not needing clearance but I have never been. Need stroker clearanced rods and a small base circle ( .900 ) camshaft...