Looking for Info / Specs on Obsolete Mopar Piston

Since the engine is apart,sorta, I would just machine the piston tops off to where I needed it to be. This is done all the time in the motorcycle world, no big deal. Of course you could always get one of those thumper cams. They do a good job of killing off some compression. And of course you are set up perfectly for some open chamber aluminum Eddies.
Yeah, I am a big fan of compression. It makes a snappy bottom end and a strong midrange, and it makes for a much more efficient part throttle. Sometimes,I like to look at it from a dollars to mile perspective. Sometimes burning hi-test in a hi-c engine, gets to be nearly as cheap as burning 87 in a low-C, in dollars per mile. And the Hi-c engine has so many benefits.
But above all, the engine has to survive full-load WOT operation.
There are some tricks you can use on a hi-c or too-hi hi-c engine, to help it survive. They are temperature,load,and timing
You can;
1) increase the chamber turbulence,increase the chamber efficiency, or reduce the chamber temperature,and/or control the engine temperature over a very narrow operating range.
3) run fresh cold air into the carb; this is a really big deal
4) reduce the load; either with gearing, or chassis lightening,or stall speed, or a smaller carb, or driving style.
5) retard the full-load WOT timing, and/or delay the all-in timing to something like 3000/3600 rpm, and/or slow the rate of advance from the stall rpm to the all-in rpm
6) And of course,reduce the compression

In my 360, I was able to run 11.3Scr using all the tricks, except #6, and while running 87E10.And then I put the 750DP back on.

But, for your application, considering all factors, I think #6 is probably the best option. You are probably 1/2 point too high on Dcr. With iron heads 165psi is usually a nice safe bet. For low-rpm useage as a cruiser, you will not even notice the slight power loss; you will just drive a little deeper into the carb from time to time. And if you get your throttle pressure set just right, you will be able downshift the tranny using the gas pedal. Besides that cam is a real torque maker, I mean compared to the 292/508.
If that TC stalled at 2500 with the big cam, it should stall a little higher with the little one;hopefully. If not I really enjoyed a 2800.