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[HD Street Performance]

I am not sure what you are asking? The TW888 VS the 296 is so close I am not sure a change is justified unless the compression is bumped 3 or 4 tenths. Even that said the pipe will do more for you.
BTW Tim if the TR625 is soft off idle there is something else wrong not the cam, the recipe or the tune.

[*58Vette]

Alright, after looking over all of the cams.  I believe your right; the cams might not make a lot of change.  The TW888 and the Tman 625 have almost identical valve timing, just different ramps and Tman has .050 more lift.  The 296 advanced 4 makes the cam close to the others.  I'm sure the 625s lift deffinately would help some, but how much.  The 296s would probably be somewhere in the middle between the 888 and 625s.  I guess the 2.5 cores would probably do the most and with a better tune.