How much will this cam add?

How much HORSEPOWER will this cam add?

I have a 306 Short Block with a Crane 2030 Cam installed. The setup has forged SpeedPro Pistons and 9.5.1 compression. I had it in my other stang nothing wrong with it at all. I dindt have the puller to take the one in my car out now. It is a 306 stock cam 26k on it. I left it in and put my Edelbrock RPM heads and my Edelbrock Perf. intake as well as my full exhaust and 1.6 rocker tb mass air cold air blah blah. How much power am I missing out on with the spair cam lying in the corner of my garage? And with mechanical skills of bout 6 outa 10 (Ive done all the work myself) How hard would it be to do the cam swap while motor is in the car. I have to pull the lifters out first and then put them back in right so manifold is off? Thanks in advance!
 
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