If I cut the belt to my smog pump will my exhaust be richer and in return tell my o2 sensor it is rich making the computer lean out the fuel ratio?

No, You probably misunderstand what the smog pump is doing. All the smog pump is for is to warm up your cats quicker, then they bypass and do nothing. Removing your smog pump will have no effect on how rich or lean your engine runs. Be aware however that removing your smog pump even if you are in a no smog check area is a Federal Crime (yes I know, but if the smog nazi's are around, they can nail you)

Thank you for the info, this is going to be a 100% off road vehicle.

I cut the belt along time ago on my 86. Maybe a couple of horse power difference. No smog police around here thank god!

i would like to bypass my smog pump what size belt whould i need? thanks

I would check with Summit. I believe they have info on what you need.

ever find that belt size?

My engine had a seperate v belt, so I could remove it w/o affecting the other belts.

there's a good tech article on the site here on how to remove your smog pump:
http://www.thirdgen.org/serpentine