'68 Barracuda Notch

I'd like to get someone to take a look at the car and do a little tuning on it. It starts up fine, but wants to die without a little gas and until it's a little warm. Putting it into gear without a little gas will do the same. I'm not the best technician when it comes to diagnosing sounds, but at WOT I occasionally hear what I think could be pinging.

All in all, I think the car feels like a slouch. 360 bored .30 with a Holley 4 barrel 670, 280.480 cam, 727 with 2800-3200 stall converter, 8.75 rear end with 3.23 gears. Are my expectations too high? My brother's '09 Challenger 5.7 feels like a race car compared to it and I think my old 4.0 Jeep could give it a run for its money. The throttle response is lousy and it just doesn't have the get up and go that I expected.

The car sounds fantastic, but I just want the bite to be as good as the bark.