I love playing around in desk top dyno. I don't know how well what we see translates into the real world. I can tell you when I used desk top dyno to check cams for my 434 build it came out very very close!
I have some info here for comparison. I think the comparison would be as much for entertainment value. It is hard to learn anything from 2 different engines. If you have identical engines on identical dyno's then a single change can be relevent. Beyond that much is speculative. Just the same this is interesting.
First my engine is a 434 with several differences. As George said the increase in cubes will tame an agressive cam some what. I have not ran my engine in the car but the engine builder says it idles like a factory engine; kind of a sleeper almost. Throttle reponse is imediate and agressive.
That being said, I ran your cam and my cam in the DD just to see the difference. I used some general 351 cleveand specs so the HP number are meaning less except for the fact that the only difference between the two is the cam. DD had your cam so I ran withy their specs (which matched what you gave me). Here was the numbers for your cam:
Here are the numbers for my cam:
Here is the same engine compared with the cams being the only difference:
Your cam no doubt made more power then mine; epsecially at lower rpm which is where I was looking for power. One difference comes to mind here. Your cam has a bit more agressive ramp rate which I am guessing will be harder on solid lifters (lifters in general). It is very similar to mine with some differences.
This makes for some interesting "internet theories"!
I will let you know how mine runs when I get it in the car.
Gary