Well a few observations. I basically prefer aluminum all the time these days, reparability is a part of it but for me weight is the main reason. I think we make a bit of power but I no way believe that the loss of power, if any is made up but the weight savings. Give me the 165-175lbs less weight any day.

The heads up car is also an ALUMINUM block and being a SB Chebbie the choices are endless. The aluminum block was chosen for the same reason. Weight savings.

As for Mopar blocks, they are out there to be certain. When you see one you need to be ready to act. Another thing is on some(indy)if they need sleeves it can get expensive to purchase and have them installed. Not a lot of places will do sleeves in those blocks. Also beware of a block with zero history. At a point aluminum gets "soft" through heat cycles. No different than aluminum rods. I have purchased a few over the years and been bitten once by "soft" material.