Rod to Rod Clearance how much is too much ?

You are about .020" wider than the factory specification......don't sweat it. I've seen .120" (yes, 1/8") side clearance with spacers over the pin between the sides of the piston and rod to hold the rod in place under the piston. I've got a 451 with .035 side clearance making 787 HP @ 7200 rpm. I'm telling you, .035" is okay.