What size?
I personally think an 11" wide wheel on a Camaro is too big.
But to your question, yes those tiers will fit on the wheels you talk about. A 295, is just over 11" wide and a 275 is just over 10 inches wide.
With you being lowered will also persent some problems. More than likely going to need to roll the rear quarter lips, and do the BFH mod to the inner wheel well.
I have 18" x 9.5" w/ 275's up front and 18" x 10.5" w/295's out back, both with 38 mm offsets. I have issues on all four corners, nothing huge, but all annoyances . . .

