Even though this is an "open" chamber without an official quench band, you create/enhance one around the annular edge of the new bore with the larger piston.
The estimated P-H clearances given above (.031" + .050") are right at the vanishing point for quench. I would certainly be looking for a thinner head gasket to close the TDC clearance to .035" minimum.
Resist any impulse you may have to radius the chamber edge out to the actual bore!
