Well all I have researched some and it seems like there are too many cams to choose from. first some history since I dont post on here as much as most. my truck is a 1968 short bed pickup I installed a 5.3 and 4l60e tranny with a TB converter and transgo shift kit. Emmisions aren't a concern. I have Z06 exhaust manifolds into true duals no catts. I have CAI that is plumbed to outside air that is forced into it thru the grill. The truck weighs around 3900-4000 pounds. 3.73 gearing and last but not least Allen tuned. It runs very strong and reliable.

now for the cam I want something that give some thump but want to drive it around and be able to hop in for a 4-5 hour road trip. What happens when cruising at 2100 RPM at highway speeds with a cam rated from 1800-6500 or so? I dont want to hurt my cruising stuff.
My initial thoughts were for a TR220 but I am very open. I currently have 2003 Z06 springs and pushrods and would like to use them unless this is just a mistake.

like I said it runs great now but know there is more potential in these 5.3 motors that I havent seen yet.
sorry for the long post but maybe I covered most of the questions. I would prefer to find a used one to save some money but dont want to settle for something that is not what I want or need.
Thanks
Dave

part of this was posted but I didnt want to continue to jack the other thread