Need help with dual exhaust 74 Dart sedan

Hi Everyone, I am a new member, and this is my first post. Bought my first A body last fall and I am going to be doing a small block conversion next month. I believe with all your past posts on V8 conversions I have everything I need except for the exhaust. I have access to a shop for a weekend and was hoping to do the complete exhaust at the same time. I have Hedman long tubes and Flowmaster mufflers. My question is, what's the distance from the drivers collector to the front of the muffler? I have a bunch of curved 2.5" pipes and some S pipes, I just have to order some straight pipe and don't want to be short. Appreciate any help. Thanks in advance.