ok, gotcha. this is what the head i used looks like, it has the little decompression nub on it. the fins do line up when i match the decomp nub on the head up with the decomp hole on the cylinder, so when i read your first comment about things not lining up when things were correct, i got a little concerned i was missing something.
<a href="http://www.flickr.com/photos/uhoh/2458367538/" title="DSC_4866 by uhohphoto, on Flickr"><img src="http://farm3.static.flickr.com/2240/2458367538_0e0cb2c571.jpg" width="500" height="333" alt="DSC_4866" /></a>