Steve, you may think you are asking a very simple question, and I don't mean to tell you how to make a watch when you are asking for the time! Fastener torque is a very hot topic in the engineering world and keeps evolving all the time. As a proto type Machinist in the web press industry for many years "Retired" I always raided our engineering department combing through our manuals for fastener industry standards. We used some basic formulas, Torque applied/nominal Dia./Coefficent of friction/tension/empirical torque adder and many other considerations such as material, thread pitch, thread angle 29.5 degrees, and so on. But, let's get back to your question, I made a quick check in my "Triumph" Bentley manual that may apply. Tightening the ball joint housing to the upper wish bone 24 to 32 lbf. Tightening torque for the nut securing the ball joint to the vertical link is 35 to 50 lbf. the slotted trunnion nut torque is 50 to 65 lbf. I used my manual when rebuilding my Tr-6 front end with very good results. Of course follow your "Healey manual" for idler end float specs and follow your manual for other related specs as you move around your car. You may want to self educate and research this topic. I always found it interesting.