Year of change on lower intake?

[ChevyCummins]

I need clarification "what year did GM change the lower intake bolt mounting hole angle into heads? What about the exhaust manifolds, any changes with mounting angles? I have access to parts on a late model engine, but need to use parts on a 95 6.5 td.
Thanks

[DmaxMaverick]

It wasn't the year model, but the application that determined the alternate intake bolt angle. Vans, Hummers, some marine/stationary, and/or rear-mount turbo. The exhaust bolt holes are all the same, for any application.