Alan, people can doubtless tell you what they apply, but there were never any factory settings published. Also with 80 or 90 year old components things are not quite so predictable as on a new car, so tread carefully.
You can fairly safely tighten your head studs to 20lbft. Follow the recommended tightening sequence, and do it incrementally not all in one go. After first running the engine wait till it is stone cold then re-tighten, as some settling may occur - especially important with alloy heads. You must recognise that if your studs are old and weakened there is a risk they may shear under tightening.
As for big ends I'll let someone else answer as I don't use standard Austin rods (- 18lbft or so I think?)
You can fairly safely tighten your head studs to 20lbft. Follow the recommended tightening sequence, and do it incrementally not all in one go. After first running the engine wait till it is stone cold then re-tighten, as some settling may occur - especially important with alloy heads. You must recognise that if your studs are old and weakened there is a risk they may shear under tightening.
As for big ends I'll let someone else answer as I don't use standard Austin rods (- 18lbft or so I think?)