confused - or just a stupid question

I have a sim. set up in heads (sorry about jumping in on this thread)
318 heads port and polish (intake and exhaust) job, a 3 angle valve job and decked 20 thou.

I was told by the guy that he was told " it would loose low end torqe to if to much was taken out" so they did a "Happy medium".
will i run into the same problem
I have sim set up but 262 cam and 8 3/4 w/ 3.23