Its been a while since Ive messed with Carbs. This weekend Im dropping a 92 model SBC in my stepdads 86 PU. Were going with a carb set up on it. His 69 Camaro has a 330 hp crate engine (ZZ4??) and has a small Edelbrock carb on it. I plan on swapping the Edelbrock to the truck, and hes getting a Holley 700 for the car. Im sure the Edelbrock wont be much to adjust for the truck, but I'm a little rusty on carbs anyway.
What I need to know is what kind of jetting to start with on the Holley. Were at sea level, in south La. From what I remember, the Holleys arent exactly an "out of the box" carb, but I may be mistaken. Any help is appreciated, thanks.

 

I would start out with the settings ran in all the way and back them out 21/2 turns and start it up and tune from there... changing jets is all in how you want it to run.. its been a while since I screwed with a holley myself.

 

2 1/2 turns is WAY fat on the idle circuit. Start with 1 full turn out. You probably will need to start around 84 or so on the jets and do some plug reading. The idle screws will only adjust the idle circuit and control how rich you run at idle.

Is the carb a mechanical secondary or vacuum and is it a double pumper or ????

I personally would recomend you get a vacuum secondary for the street. Holleys are simple as hell to tune compared to a quadrajunk......Nothing to it. Just make sure you check the plugs and don't over carb the engine. a 700 cfm carb may be a little much for a small block. I run a 750 holley dp on my 472ci 500hp ford in my jet boat. I would stick with a 600 or smaller. You will get better vacuum signal and a more responsive carb.

People commonly mistake the cfm numbers for how much fuel a carb will flow. this is not the case. If you over carb an engine the vacuum signal sucks and the engine will be a dog until higher RPM.

 

Im not the carb man by far but I do do alot of carb work on four wheelers. Easy rule of thumb.

Idle=fuel mixture screw
Idle-1/4 throttle is needle
1/4-full throttle is main jets

I think this applys for a car carb.

 

this does not apply to a holley as holleys do not have needles. they have metering blocks.

A holley would be more like this

idle=fuel mixture screw....everything else=jets and power valve size.

The cfm of the carb matching the performance and displacement of the engine is the most important thing with any carb.