TRW L2348 pistons streetable?

Is there a cost effective way to make these dome pistons have less compression to use on a 60% track 50% street cruising fun car.
I have a new set that I picked up cheap and would like to put them to use, I was saving them to build a race car but another car now may be a while. I have a couple sets of Closed Chamber heads so I would not want to buy open heads now.
I have one set of cc heads that were running in my car before and one chamber has some scars from a previous owners valve failure. They are not bad and I was thinking if I grind out the chambers to open them up a little, like perhaps smoothing out the sharp edge around the chamber it may lower it enough to run on 93 premium pump gas.
Of course I am not an experienced porter so I will have to learn as I go and buy the tools for cc'ing the heads.
Or would using thick copper head gaskets bring it down. Also not decking the block so they stay somewhat in the hole, since I have a virgin 2V low mileage block I can use.
I only drive casually on the street and will not be doing hardly any full throttle runs on the street except when I go to the track and then I wouldnt mind adding some race gas mix and advancing the timing on those occasions.
Anone tried this before?
Also what crank is better a 1972 from a 2V or a 1970 from a 4V they are both standard size, the 4V looks to have a small ground off area with a deep dot punched in, I think I read this was for hardness testing. Or are they the same for a street strip motor that will go about 6500 rpm