I just came across another option which is interesting. Hughes Engines has a special kit made for them which makes a 426 inch motor in a 360 block. They have a crank with 360 mains but 4.180 stroke.

There crank uses a small rod pin, Quad 4 I think. They say it installs with very little grinding due to the smaller rod pins. The pistons are setup for pump gas with the CR about 9.75:1 with Edelbrock heads.