You can offset grind your 4" mopar journal crank to a 4.125" by using the 2.00" '327' chevy journal rod. Bobweight will be lighter too since you also go to a lighter .927 pin.

WIZE

World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker!

https://www.youtube.com/watch?v=-mWzLma3YGI

In Car:

https://www.youtube.com/watch?v=PjXcf95e6v0