Help me to choose the right cam

Can someone help me to understand these different camshaft profiles, Id like to understand what they are doing and why, also Im assuming I can run these cams with no other modifications but correct me if Im wrong.

Used to be a guy that posted on here ( used to be alot of guys that helped me greatly ) name Krazycuda, back then I could almost ( thanks to Karl ) look at these profiles myself and answer my own question but I guess its one of those things that if you dont use it every now and again its sort of forgotten.

This 21-225-4(Single Bolt) - Xtreme Energy™ Hydraulic Flat Tappet Camshafts
is the cam that was in my 1978 ( block ) 440 when I purchased it a week or so ago. I never heard the engine run and right now its at the machine shop having the machine work done.

I plan to have roughly 9.1 compression or so but Im not set on that.

I was told it sounded really good with alot of lump.

For that cam this ............If you want a truck that works take about 20° duration off those specifications and drop the compression ratio to 8.5:1.............piece of advice was given and this guy I believe knows what hes talking about.

This cam 21-600-5 - Hydraulic Flat Tappet Camshaft was suggested to me as an alternative.

This engine is going in a 6000 pound truck, Im not looking for speed, it just isnt going to happen and would be a dumb goal to try and achieve in my opinion considering its application. Truck has 31s on it now but am prob. going to 33s or 36s. Manual trans with granny gear, 3.55 gears all the way around.

Main use is show, secondary use is possibly as some point Id pull a trailer but I think that prob. is unrealistic considering I want it to sound mean. ( Ive read recently that mean sounding and torque dont go hand in hand )

Other engine mods will include mild head cleanup of the 345 heads, stock center dump truck manifolds with a 2.5 inch exgaust ) a gear drive, I plan to re-learn CCing the heads, measuring how far down in the hole the piston is so I can choose the correct piston. Its got a 440 performer intake on it now with matching carb but I may change that to a performer RPM if that makes any sense.