Is there a desireable piston dome to deck clearance?

Wiseco is also set up to make the correct MEL piston. Seeing as how I can put the pin location anywhere I want it, is there a desirable value for the head to piston dome clearance?. I was going to shoot for 0.040" unless I get information that says otherwise. I'm planning to lower the compression ratio on the non-dome portion of the piston to get it pump gas happy.

Also as an FYI, when I tore down the +060 410 engine that I'm working on, the pistons were installed upside down (dome in the lower portion of the bore). Customer swears it wasn't detonating. I put one of the pistons back in the bore with the correct orientation and upon putting the head back on, the valves were contacting the piston upon nearing TDC. So I can surmise at this point that either whoever hung the pistons originally just arbitrarily installed the pistons with the dome 'down' like a normal pop-up piston or they had the aforementioned piston to valve contact issue and simply turned the pistons around. These are the Kanter pistons and did not have any supplied valve reliefs. Other problems with these pistons were not enough cam ground into the skirts and three pistons had centered wrist pins while five were offset. The five that had the offset pins were all to the same side of the piston.

Ted E.
Fe's are a thrill a second when they run mid eights but Y-Blocks are just plain fun when they run 9.60's at 135mph in the quarter.