Holley Jetting suggestions for 470CI Stroker?

[Corellian Corvette]

I'm new to the Holley world (I'm more comfortable with edelbrocks and q-jets), and many friends have suggested my 470ci stroker will perform better with a Holley. I have an 850CFM Edelbrock on there now, which it was dyno'd against (470hp, 540tq) and the driveability is good but there is no real top-end. My 383 Chevy stroker in my vette pulls harder at the top with a well-tuned quadrajet when the big secondaries open.

So... a buddy loaned me a Holley 4777 (700 cfm mechanical secondaries carb) to try out. I got it installed, and it idles pretty nice. It's got a bad stumble when the secondaries kick in (this is all in the garage, it hasn't been on the street yet) and I believe it's running lean as the idle screws are ~ 3 turns out (i think stock is 1.5 turns), and of course the HUGE stumble when I hit the secondaries.

So I think I need to richen up. I don't know what's in there now, and I've ordered a holley jet kit from Summit so I can get started.

Anyone running a Holley mechanical secondaries with an automatic have any tips on a jetting to start with? Any good tips on how to size secondaries?

Thanks!

Engine
470ci stroker (mild cam, hyd roller)
Edelbrock Performer heads
Mopar Peformance Stock replacement intake
Factory iron manfiolds
3:55 rear gears
727 Automatic with 2400 stall

[firefighter3931]

A 700 cfm carb is going to be small on a 470, especially if you are running a dual plane intake manifold. The flat spot is a lean bog and can be tuned with a larger discharge nozzle (squirter)

See how it drives under load and report back.

- what cam are you using
- what timing : base and total


Ron

[Corellian Corvette]

Thanks Ron

What CFM would you recommend? The online calculators I used said 700 should be fine since I don't spin the motor past 5500. I'm borrowing the 700 just to play around, and I may buy another one just for this motor. Would an 850 work?

I don't have the cam specs - it's pretty mild. I like to have my motors built for good street manners so no lumpy cams - I'm pulling 15+ hg at 900 rpm. I'll try and find the specs.

Timing is 36 total, 17 base w/ Vac Advance on manifold (so my true base is like 33, as I have a 16deg vac can)

How can I tell what "squirter" I have? And what it should be (if you have general guidance)