Changing your camshaft is the most important choice you can make. You said you picked 3 cams, but I see 4 photos. #2 is roller with a dual pattern grind to get the exhaust open quicker. Plus with a lobe centerline of 112 will improve cylinder pressures at the low to mid RPM range. Using roller lifters is taking advantage of the best of the choices, but as always, springs are very important and possible contact with seal or retainer. This is where many get the degree wheel out, dust it off and install a dial indicator on the push rod with a temp weak valve spring to setup. Ask your nearby buddies to help out. Most, like us will pitch in with advice, weekend help...just have some beer in the fridge (Their favorite kind).
The lower "Lobe Separation Angle" is lower cylinder pressures, good for higher RPM and choppy idle, lower vacuum and may suggest a stall convertor to keep from pulling at the red light. A higher "LSA" will increase pressures, good for low to mid range torque and with 112 lobe centerline, you will have a nice idle note.
Exhaust makes the sound but the cam makes the note. A trumpet makes noise, but the player make the tune.
Roller is more expensive buy allows for more features like the dual pattern to hit hard during downshift towing as well at cruise speeds. Yes... new roller lifters, springs, quality pushrods plus a new TC&G will last a long time and serve you well. You will find it on everything new that is not Over-Head-Cam. Note for best practices; proper pre-lube, ready to start (Tools for adjusting lash / ways to do it right before starting also), let run at 1,500 - 2,000 RPM's for a good 15 - 20 minutes for proper breaking upon first start, so just be ready, plan your time of day because it does take time to adjust afterwards (Timing, check idle, leaks, etc.)
My advice is the call the tech line at COMP. Have your notes ready as they will ask for intended use, engine modifications like headers, tube size, tranny, stock convertor or not, final drive ratio and tire size. Other than that...it's easy! Ha, Ha.
Retired ASE Master tech