My brother and I have a mitt full of GMS engines...2-.47s, 3-.61s and 2-.76s..... all great runners.
I also have a TH.75 and it is a super strong, very reliable engine that has a home in my Tiger 60. As good as the OS we run.
Too bad that they are not available anymore....
On a brighter note, there is a gent up here that has a NIB TH.75 that I can get hold of for 110.00 shipped.....just might snag that one up for later.