Looking for info on discoed TRW 340 pistons .

The block has had the machine work done . I'm likely going to need something similar, as in a forged piston . Something with like clearances. I've checked 1 location in 1 bore with a telescoping gauge and dial caliper finding a measurement of 4.068 .
There is also the issue of no main bearing caps.
Will a line bore of the mains change anything , or cause distortion.
I need to take it to a shop and have it evaluated. Get a better idea of what I've really got to work with here .
What's it worth ?
I did know the man who started the work. Sadly , no longer among us . I know he knew his **** and loved his Barracudas and going fast .
Just noticed yesterday while doing some cleaning of the block the beginning of some oiling mods possibly . 2 holes drilled and 2 more (I think,or maybe 1) punch marks in the valley.
1 of the drilled holes is on top of the rear rail near dist. opening .
maybe get cpl px of that for tomorrow. Get some input from the consortium here .
And then a thread looking for a good MoPar knowledgeable machine shop near 46310 .
Hughes and Indy aren't far from me but I've read some poor words about both of them recently.