Need some guidance here from the guru's

[sixTsix]

Gents, I am fixing to order slew of parts for the front end of my truck and I want to make sure I'm heading in the right direction here. I'm sure this subject has been beat to death before ..but did a search and didn't find exactly the answer I was looking for so....
Ok so my main question here is how low can I bring the front end down before I start to have issues with fender clearance's on the front. I was heading for 2.5 drop spindles and 2" drop springs. I just want to make sure I wont have issues at that height with out going modular spindal's I will be running 15x7 wheels ( either wheel vintiques steelies or alum slots) and probably a 60 series tire. I figured at this height I would more than likey need modular spindles. Do the gurus think that I will have issues?