Hi pattern nut,

To answer your question, if you can tune your 160, and be able to tell when its rich or lean, then fit the velocity stack and try it. If you can't tune your engine as a lot of guys can't, then here is a good chance to learn. We all have to start somewhere.
If you search back through previous post's all of your questions will be answered.

As Troy is no longer on this site, you guys have to learn to do things yourself, and there are plenty of guys still on this site with experiance who can help, what one dosn't know, someone else will.

Will Crossman