Why would you take the time to reserach this like you did and spend the money needed to build a cheap cast piston short block when you know that it could fail at speed and end up hurting you or the car or both
I wouldn't do that
Build a decent short block and use it to get educated on this technology and proceed on
The short block is a low-mileage (35k) from a 74 New Yorker that I did yard work in trade for the motor and transmission years ago. There was no "building" done so to speak, just a cam and deep oil pan from when I was going to go a different direction with the motor. If it blows up, it blows up(got another motor on stand by anyways). Im not trying to make 1000+hp to the ground, just something fun on a soft tune up that is different from 90% of the mopars you see and can still make my 30mile commute to work and live on the fantastic 91pump out here.
