Introducing delay in output pin

I would recommend timing constraint. Take a look here:

http://www.alterawiki.com/wiki/source_synchronous_analysis_with_timequest

It's really long, but if you look at the Getting Started and then use Case 3 or Case 4 of the Explicit Clock Shift MEthod, you should be able to do it pretty quickly. If the delay chain only has two settings(I don't remember), then you're not going to be able to dial them in exact, and it's up to timing constraints to see where you're at.