That is a pretty neat old truck you have there. The only advice I can pass along to you about the whole thing is on the basis of the exhaust, and this is an opinion. I would run the exhaust out the back whenever possible. It always helps to reduce the drone in the cab and under the vehicle. I had a mustang with dumps underneath and I did not care for it, but that is a car that sits a few inches off of the ground and you are doing a truck, so it could be different. It will likely cost a little more to go out the back, but I am a fan of it.

Good luck with your build and keep us up to date with the info and pics!

Adam