1974 Cummins NHC 250 needs turbo?
 

Greetings,
I have a old but fresh Cummins NHC 250. I want to add a turbo and was wondering if anybody is familar with these older motors and can lend me some info. I have seen it done but don't have any of the specifics as to what and how they figured out the proper turbo size. I am not looking for a motor eating hot rod just a little more power.
I find that the exhaust manifolds from the bigger motors bolt up. But how do I figure out what is the right size Turbo is the issue at hand?

an ht60 would be fine or an hx50

go big or go home!!

get a turbo from a 290 or 350 cummins. ht3b. the 250's are very similar to the 290's except they were naturally aspirated.