Any good ideas on building a bell crank for a banger?

Looking for a bell crank for my banger. Can't find one anywhere so I guess I need to make one. Any good ideas appreciated. I have a scalded dog intake.

 

Brandon, When I bought mine it came with instructions to make the linkage. I think I still have them.

 

I would love to get see a copy. I got mine from Peranios in Texas without instructions. Let me know. Thanks