Looks good i dont know much about big chevy but you seem to have all the bases covered. Cam doesnt look whimpy at least. I have never installed a cam too big just valves that were too small. LoL
Did you have the cam and crank lined bored. I hear it is a problem with big chevy. That is why aftermarket blocks are such good sellers.
The closer your going to come to 500 cubes or more the bigger the cam needs to be. Just as a rule but nothing to help on big chevys.
This is the standard for engine math and performance tuning. If you really want to calculate it all out.