I've been driving my car around for about a month now and everything runs great. However, I really don't feel that much of a difference in power, I do feel the hole that it is making in my pocket though (mileage). I can tell there's more power but less than I expected. My thoughts is that the duration of the cam 216/218 is too much for my completely stock intake. Does anyone concur? Well let me know what you guys think.

Mods are in sig.

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1991 Camaro Z28
305TPI Auto
S/R Torquer Heads
LPE216 Cam (216/218 .462/.470 112LSA)
TES Headers w/3" exhaust
Homemade AFPR @50psi
Hypertech Chip
K&N's
More on the way...

 

It's probably a little too much cam to work well with your combo, but you should still feel more gain over stock.
I'd suspect you need a custom prom to get it to run right.

 

Lingenfelter recommends high flow runners with that cam.

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90 IROC
SuperRamed 406
Trickflow 23* heads