Staying stock, you are better off with an iron crank. It doesn't transmit as much shock into the blocks main web areas and I will point out that by your own description of the intended use of this engine, you need as heavy a balancer as you can find.
As I have said before, my favorite is the Ford Boss balancer.
The stock 4v balancer AT BEST is only good for 6,000 rpm in this engine.
I do have to admit though that I think when you use one, you don't need to hang a huge plastic scrotum from the rear suspension.
Just look at the balancer. That should be enough to realize the stud potential of the engine? That thing is huge!
If your stock equipment is lacking, you are on your own as to which device to substitue for best results? Ask around. Take some pictures of the test subjects and send them to me in a PM?
