I installed a 528 in my '71 charger. TTI 2 1/8" tubes, V8 k member with conversion mounts. A mockup outside the engine compartment will help a lot. The dipstick tube was a real bear to deal with. Probably took me 4 hours to get all of the bugs worked out. That was the largest PITA. Header bolts with 3/8" (?) heads help ,and could be accessed underneath. Most important though is getting that dipstick tube right outside of the car! I must have removed and installed drivers header a dozen times to fit that tube right. Passenger side is very tight.