You'd be better off selling the car privately and then using the cash from that sale to buy an SS car. Swapping from a V6 to a V8 is not as easy as just pulling the old and dropping in the new and usually involves having to drop the tank, change fuel pumps, ECU's, possibly some electronics under the dash to get your gauges right...etc...etc. It's usually more time and effort than you could just swap cars for.
Not to mention, when you go to sell it...any prospective buyer is going to be very leary of a car that's had an engine swap.
Just my .02 on it, but do what makes ya happy.
BTW - should be getting my ZL1 from CarMax here in the next week or two. Had one shipped in from Ohio. I'm out in Paulding county.