360 questions

IMO, besides just run it first, see how it is and then mess with it later, I'd just change the cam to suite your particular need. But then again, that cam in there may suite.

Head flow over compression. Don't bother swapping heads out for a higher ratio since the smaller port will lower the performance ceiling of what you all ready have. IF it was indded designed to do truck duty, and the cam is to suite a truck, it is small and a smaller head makes the package smaller.