[Healeys] BJ8 Lubrication question

[gturl at sympatico.ca]

Its time for an oil change and I'm wondering what kind of engine oil would be
most appropriate for a big Healey. I think someone once recommended 5W50
Synthetic but I cant be sure (ie I cant find my notes!).
While I'm on the subject, what gearbox lubricant do most people use? I
understand I should avoid anything containing teflon for fear of interfering
with the synchromesh.
Thanks in advance..
Carol and Geoff