[HawgRyder]

The counter weights on the crank do not necessarily have to be bigger.
With the advance of technology over the years...the rod/piston combo has gotten lighter.
This means less weight to balance.
If you have a clean sheet of paper to start with...you are ahead of the curve...and the design can be changed to suit your needs.
BTW...are the bearings (NASCAR type) going to be Clevite or Michigan 77 ?
I have had great luck with those over the years in a lot of different engines.
In Chevy sizes...they are available grooved or pinned and even micro-grooved (looks like the veins in a leaf) for oil dispersion.
Bob