the short easy version?
well cyl pressure is what builds torque, a cam with a narrow lsa and long duration will already be sacrificing cyl pressure, so using this cam on a low compression motor will have even less cyl pressure, will not have enough vacuum to idle at a low rpm, you have to jack the rpm up to nascar levels to even drive around....lol
now the opposite is also true, a very wide lsa, short duration cam coupled with a higher compression motor will build alot of cyl pressure, which is great for torque, but bad for low octane pump gas. you can have a engine with a relativly small cam, a 10.5:1 streetable c/r, and run 93 octane and still ping and have to run alot less timing than someone with a more radical cam.
now, this is how i understand it, and again, this is the short version as im tired of typin