Desktop Dyno 2000

I just got desktop dyno 2000 for free from my new bestest buddy at the machine shop. but when i enter all my info in, it says 296 hp at the fly!

this doesnt even sound remotely close to what i have had people guesstimate! could it be? only 300 hp? they were around 300 from the factory.

73 360 SB
.03 over
flat top pistons[9-9.5:1]
stock crank
eddy rpm heads[2.02/1.60]
rpm cam and lifters.
rocker rollers[most likely crane]
tti headers[thermal in/ polished ceramic out]
rpm intake[1500-5500]
700cfm [4bbl carb]

all balanced.

This seems really low, could it be the program? or the operator?
Thanks again guys,
Cerwin