Need to program my car! Help!

I need to know what would be best to do for my
1997 chevy camaro RS 3.8. The mechanic at the
shop I go to said that it needs to be programmed
because the guy never did before me after all the
engine work so the computer supposedly is trying
to run the car as if stock. It is bores 30 over, has
power sealed pistons and new crank,
ported/polished/shaved heads, block is decked, its
cammed, has msd coil packs and new plugs and
wires. All new o2 sensors on exhaust and engine.
So my question is what do I buy to upgrade the
vehicle to run normal with the upgrades.