hound dog,
how accurate do you consider the software?
and what hp is this software calculating?
old, pre 1972 SAE hp? guess so.
my engine delivered about the same numbers as your second setup, although with 496 cui ...
and don't tell that's so because mine was a chevy
seriously:
your hp ratings in the US confuse me. when punching in my numbers into the Dyno software the result was 650 hp for my engine instead of 550 as found on the dyno.
if you have the money, i would recommend the roller cam. we never had any problems, even with 10500 rpm 373 cui small blocks, or with 6900 rpm 565 cui big blocks for the Can-Am cars.
Ford cams shouldn't be weaker at any point - it's only steel.
dominik