Cams How do you choose one?

I just like to mention that just because the cam card says to put the cam in at 106, doesn't mean that, that is absolutely the best place to install it at.
Take this cam for instance;
256/268. 212/218 .447/.455. 110/106. ICA 54. Ol 42
With headers that 106 is a reasonable number because the Effective overlap will be 40*
But with log manifolds, the overlap will not be effective so then; is there a better install?
Well the 256 to 268 split gives you a lotta freedom to move it around.
So if your cylinder pressure is low, then you can close the intake sooner and trap some extra cylinder pressure. Say you put it in at 102 for an Ica of 50*, and pick up 6psi, good deal. The downside is you lose that same 4* on the powerstroke, and so the fuel mileage may suffer.
Or say you have a lot of pressure and would like to pump up the mpgs. In this case you could install that cam at 114 for an Ica of 62*. This would move the power peak up some, kill some pressure and increase the power extraction to 8* over what it was, when installed at 106 . Maybe it works and maybe the loss of pressure makes it a draw.
The point is that a 12* split can be a good tuning tool with log manifolds.
But I wouldn't run it with headers, unless the heads really need the exhaust help, cuz it could sacrifice too much fuel economy if you advance it too far.
That cam will probably like 106 with headers; but with logs,could probably be installed pretty much anywhere between 102 and 112, depending on your cylinder pressure/compression ratio, and need for fuel-economy.
Jus saying