Like I said, my build is similiar. Car a little earlier but no lighter, approx 2200kg. C6 (40yrs old) with the 2.7 diff.
Holley street dom single plane (for the Propane) and slightly bigger carb (725 vs 600) than ideal.
Not quite as snappy down low-still ok-but does start to wind up later and still shifts around the 4500rpm mark at wot.
In saying that, I bought the car with the old engine and rebuilt it myself and it definitely goes a LOT harder than before even down low so who's to say it's not as snappy. What I have on it would suggest a slightly smaller carb and a decent dual plane would increase low down torque.
I did build it to suit h/way speed and propane use though.