'71 Duster 440 or 360? Pros and cons

'71 Duster 440 or 360? Pros and cons

I just did a little bit of tear-down to see what I have. Everything inside the motor is very clean. My heads are 3462346 casting. Are these considered to be OK for performance use? I would definitely have to rebuild this thing to get any power out of it. The cylinder walls look awesome but, the flat-top pistons are .45" down in the hole!!! Is that fairly typical for these late 440's? I appreciate all the responses thus far!