Adding 22 cubes,,, power increase? 528 to 550

Agreed on not changing anything on the cam timing, and the data logger is especially useful. I would probably run the tighter converter, too, if it's "blowing through the converter" now, it's going to be worse with the extra displacement and especially the longer stoke. Good job on the data logger! I imagine your monitoring individual exhaust Port gas temperatures to help with the fuel tuning?