Billet 390 420 Engine Blocks ????

They make a billet ohv that can go 3.5 Bore or larger with the 3 Inch 1 inch journal crank. That seems to be the weak point on them but people have added deck exextensions longer rods and took compression away which seems to help. I heard of a new design but they never post on here or on there website so I don't know what they are doing.