[Vwdiesel] .85mm or 1.15mm IDI injection pump timing?

[j e]

attempted to search the archives but i couldn't find anything specific :(

i remember there were 2 common settings for setting the timing in the Bosch VE
injection pump which was fitted in the IDI diesel VWs. the stroke settings i remeber having timed were .85mm and 1.15mm. 
when you have an engine out of a different car or you are changing the IP how do you find out which timing stroke is the appropriate one to use?
is there a chart or a range of part numbers?
also which timing did the Turbo IPs with the altitude compensating addition use?

tank you for clarification!

john