So I bought the Quadzilla with Iquad and I been holding off installing it because I have a lot of lopping and to me too much black smoke with the 50 hp new bosh bodies. Dont know if the surging is due to this or not, I plan on sending them back to get them checked to see if theres a problem going on with them. In the mean time I though I would buy new crossover tubes just to have a piece of mind that they are good to go. Question is what injectors would you suggest to run for fuel mileage and towing with the Quadzilla?

You know my set up. +50HP injectors should be easy to build a tune for and reduce the smoke. 

 

As for loping I would check valve lash, also too much timing down too low in RPM can produce bucking.

I did set valves at 8 and 18, I read I think a post you made about that. I just hate ticking valves.