I have a Headache.... Need some insight into Exhaust...

x18 casting magnum big mouth logs into 2.5 head pipes to some full flow mufflers. That or build your own. Not that hard if you got the time. I have owned 2 and dealt with this issue off and on for 30 years. Put #1 tube straight down and back under steering gear, 3 goes up and over 5 like many shelf headers and down behind 7. 7 is stock down and back. So you may end up with only 1.5 tubes off a stock 67 set that need to be modded. Passenger side is a drop in but you may brush against the idler arm, should be able to figure that one out. Logs are not bad with a healthy head pipe.