I have the LS1 brakes on my 87. Based on this, I'd guess you need to have around 1/4" more offset built into whatever wheel you choose in order to maintain the original offset (if that's what you're shooting for). I think most folks suggest 5.5" backspacing for 1st gens with OE brake setups. (this is what I used for my car with OE front drum brakes).
Hth
GeoffP
68 Camaro LT1/T56
87 Camaro LT1/4L60E
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