Bit confused?!

This bottom bracket shell is now the only thing i am not understanding. I've had the threads checked and they are not 26tpi that raleigh used but, they are 24tpi which was used when carlton was their own company.

All i am unsure of now is what BB to fit. A carlton corsa frame with 120 rear spacing and miche primato track hub (42mm chainline) and sugino messenger cranks. Stated length to use was a 103mm axle.

Being a 71mm BB shell, what approach do i take?!! I can work out everything else with chainline, just not sure which BB will give me the best adjustment. English threads by the way. (sorry if thas obvious)

Once i got this cleared up it's the home straight i think!!!

Let me know how you get on. I've got two Carlton's, a 1959 Road/Path and a 1982 Criterium.

I fitted a Sugino BB to the Road/Path without problems. I'm fairly certain the Criterium is 26tpi though, which means I'm going to attempt to keep the original BB and cranks, and hopefully get away with using chainring spacers to get a good chainline with a System-Ex rear hub