Eganwp.
You sound like a man who knows a thing or two about engines and should have no problems handling a Magnum/ASP XLS .52.
Seal it up and you have a reliable great runner that is much more powerfull than those GMS/Tower 46`s GUARANTEED. The XLS is one of the absolutely most powerfull "standard" engines out there and it is cheaper than the GMS too. (from Hong Kong at least)
It weighs in at the same weight, same physical size and you can order it today, not in months
Since you like to do a little work on them (like myself) you can get some incredible results with the XLS, mine turns APC 12-4 at 15000 rpm static (mousse can, port work, headshims) Your 11-6 would be about the same
