Tunnel ram or no tunnel ram...

This is what main body looks like.
Screw in restrictors ale 0.049” or very close to it.
That’s your lean cruise. Normaly those are in the .070’s range on a 4150. I’d start .078 as a starting point but, you could remove them initial pay for a drive to see how it acts.Where’s the hole going in your angle channel in the pic I posted? That main body doesn’t even appear to be drilled for a 3rd circuit. So I don’t see it in your blocks or main body. 3 circuit blocks normally look way different. Those are ringers for a 2 circ.