What are your cam specs?

I had 2.76's behind my 493 with an MP509 cam and stock converter in a 4800 lb C-body.

With over 500 ft/lbs from 2000 it had no problem getting around town but it wasn't "happy" cruising where a 2.76 put it.

I put in a 2800 Turbo Action converter to cushion the 1100 RPM neutral drop on the drive line and a 3.23 SG and all is good now.

Kevin