Want new wheels.....
This may help:
http://www.frrax.com/rrforum/index.php?showtopic=2284
Knowing that you want a BBK, I would look no smaller than 18" wheels. I'm running factory 17" 10spokes and while I would WANT a BBK...I have not out-driven the LS1 swap I did on my LT1.
I found a great deal on my setup and would have a tough time rationalizing spending the amount of money it would take for an aftermarket upgrade.
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Just toss one of your wheels/tires on a scale and see what you get. Then go to the link I posted and compare it to other OEM or aftermarket options.
Getting a lighter wheels is only a matter of $$$.
What doesn't look right is the size of that rat behind your car in the second picture lol.



