Just do it right, get a new Opti from GM and be done with it. Also, be sure to install it the right way please.
Although for a cam install, the opti part is there.
http://shbox.com/ci/cam_install.html
Read it over and then decide whether or not to do the install yourself.
And you need a pulley puller.
Also, may want to get new wires and or coil. But thats just me.