Those wheels are going to look great!!!
With that said, since you mentioned Summit, and this is for ANYONE who places an order (BACKorder).
I needed to order a replacement Wheel Vintiques steel wheel for my 68 utility. I was placed on backorder, then about 6 months later I get an email from Summit that the order was "cancelled". I called Summit to find that they automatically cancel an order not filled within (whatever timeframe). The sad part is, I had to re-place the order...........and now I'm back at the end of the line. I am still awaiting that rim... (coming up on 1 year)
Long story short if you want a BACKorder to stay "active" with Summit, be sure to tell them to set it active indefinitely.
Granted there may be cases where you don't want to do this, but since Wheel Vintiques (in my case) is the only supplier, it's my only choice.
Didn't mean to divert from the Camaro, ...but thought to hopefully save others the 'headache'.