Where can I download a good engine horsepower calculator?

Where can I download a good desktop dyno like program for free? I want to see how much power I will make with different cams. I also want to see what I could run in the quarter mile with different gears and stalls. Where can I download a good program that takes all that into effect before giving you an esitimate/calculation?
 
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do a search for 'performance trends engine analyzer'. it's a MUCH better program than desktop dyno. they also have a dragstrip analyzer. i plugged in the engine and car specs for a '68 and it came to within 1 mph of my actual 1/4 mile trap.