My ratty old Duster striped Demon had fenderwells. They had to bash in the firewall where the headers turned the corner to face to the back. As I contemplate what it will take to put my 540 into that car I also see frame between the frame rails and the rockers that will get in the way of mufflers. My bad for having a RB block and tall exhaust Indy heads (for which the TTI headers will not fit.
You guys should see the headers on my 71 KOS Demon. Huge tubes that basically snake their way around the stock steering. The headers say Hooker but the guy I bot the car from said he thinks that was just for contingency moolah.