The new dynapsark is here, has anybody installed one of these? Is there anything I am going to run into that is different from installing the stock opti?

 

If you follow their directions exactly, you won't have too much trouble. It's only different in that you have to put a new connector on. The directions on mine were perfect and I had no trouble.

By your sig, you don't have an aftermarket cam so dowel pin length shouldn't be a problem. Some cam manufacturers ship cams with the dowel pins too long and it will stress and eventually kill the internal bearings.