I have that carb on my 383, and I like it.
Seems to be pretty good on gas when I keep my foot out of it.
It was a Holley replacement for the original and came with my car when I bought it.
I originally planned to use something else, but decided to give it a go and see how it worked out.
My motor is an all forged bottom end with 6 inch rods, 10.25 CR.
Lunati Voodoo 60103,
Eddy Performer RPM heads, and Air Gap intake.
Pertonix Flame Thrower Dist.
TH350 with 2k stall, 3.08 rear gears.
This car is only street driven, with some tweaking like gears and an OD trans it could do better but overall I'm pleased.
Some day I will do some upgrades, right now I'm paying my son's college tuition, So it will be a while.
She runs pretty nice on pump gas too!