[Chevelle-list] Carb Help

[Matthew Post]

Hey Guys,

I'm having my 396 rebuilt and the builder recommended a Holley double pumper, either a 750 cfm or an 850 cfm , claiming I would get a bit more top end power out of the 850.

Here what I know about the engine:
396 being stroked out to 454
Edelbrock Performer RPM aluminum heads (2.19/1.88)
Edelbrock Performer RPM air-gap dual plane intake
Crower Solid lifter cam - 294/304 duration and 536/556 lift at 110 centerline

I think the 750 will probably be a better street carb, but how much power would I sacrifice?  Any thoughts out there?  Anyone have desktop dyno that can run the numbers for me?  That would be great!  Thanks!

-Matt