Good day to all, I am planning the exhaust system for my '78 440 RC and need some opinions.I have purchased a really nice set of Doug Thorley Tri-Y headers for starters.I don't want to deal with header gasket leaks and don't mind spending the extra for Remflex graphite or Percy's Seal-4-Good aluminum ones.Which would you guys use on a normal street truck up to around 400 HP? Reliability is the top priority.Also..bolts or studs? I want this system to go into a single 3" after the transfer case.I think there is room for a Y pipe , H pipe to dual inlet muffler or an X-pipe type deal.I will be doing a fuel/air guage for tuning purposes so the h or x is better in my mind for O2 sensor location....thoughts on this? I also need advice on mufflers.I want a nice deep tone with no droning...maybe Flowmaster 50's...I don't know? ??? Finally, I think the Walker 45105 tailpipe from a 92-93 Cummins truck would be a cheap solution to work with the stock exhaust location...thoughts?This 440 will always be mild and I want nice street manners for it.I do want to put EFI on it eventually but will stick to the existing Holley 4175 that's on it for now.I have attached a photo of a good design I think.Thanks to all!