The engine's were changed to OS 61 SF's, shortly after the above picture's. Chief, the stab's are epoxied in from the get go. I think LE 3 degree's negative. If you are going to keep the stab adjustable, I would recommend using steel allen screw's back there. I have a build thread on RCU, showing stripping one of these Intruder's, recovering, and securing the stab. I just used info from proven trim, etc., of other guy's Intruder's.
Vince