A 750 #1409 eddy carb would be a good choice or the 1411 if you want a bit better mileage as the metering on the latter is more emissions oriented / leaner on tip in and transition.

A 600 is too small even for a 429.

 

I was thinking 750, but then I saw a cfm calculator that said I didn't need that much. So I wasn't sure. But I know most guys run 750s on their big blocks.

 

I hate those things! You need to make sure of the rated Volumetric Efficency they are using to factor the results. Most of the older ones assume a lousy 80%VE which was fine in the 80's But most of todays intakes are close to or better than 100%.

 

A WELL TUNED reverse idle emissions Holley 600 was plenty for my old 429(1971 stock trim, dove-c heads). It had a purple vacuum secondary spring, 62 primary jets, a 39 rear plate, an 8.5 inch power valve, a 3cc pump, side hung bowls, and worked perfectly. I could not run it out of breath, even at 5500 rpm. It also had NO flat spots or bogs at all, and offered instantaneous throttle response in any situation.(I am actually going to use it for breaking in my new 460 because I know that it will fire right up) That was with MY situation, though. A 750 cfm carburetor would be the better overall choice. You would have room for future upgrades, etc.

 

Ya. I have heard of guys using a 600 and having good luck with them. I don't know why I had some trouble with the Eddy I had. It ran great, but it would just run dry when pulling or passing. I put a Holley 770 Street Avenger on it, and it got plenty of gas. But it never ran right and I could never get it adjusted right. It always smelled like gas! A guy gave me a old Carter AFB carb, and I happened to have an Eddy/Carter rebuild kit on the shelf, so I put it in there and put it on my truck. It idles good, and goes like mad when the secondaries are in, but it has a hesitation off idle and a major dead spot right before the secondaries kick in. So I just want to get a new carb and not have to mess with it anymore.

 

Given the same build parameters both a 429 and 460 will make very similar peak HP numbers albeit at at slightly different rpm levels.

We have a truck package that we build.

8.3 to 1 466
budget ported D3 heads
performer intake
curved duraspark distributor
headers with 1 3/4" or 1 7/8" primary size
voodoo 213/219 cam on a 109

The combo will repeatedly make 380 plus hp and almost 500 pound feet. With another point of static c/r the number is closer to 400 HP. This with a 750 vac sec holley with the short yellow spring or the white one.

When dynoed with a 600 holley we lose 40 HP+.

This is my rationale for stating that a 600 cfm carb is too small for a big ford.
Even on a relatively stock engine a 750 holly brings noticable gains in midrange and peak numbers.

 

As I uave stated several times I have gained 12mpg when going from a 600 to a 750 on several 460's the 600 is choking them and creates too much velocity past the boosters sucking in too much fuel and not enough air. The tuniing window is also very small with the smaller carb just not worth trying to use one as far as I am concerned.

 

So, Mad Porter, Just out of curiousity; how much horsepower would you say my motor is making roughly? It has stock heads, and I listed the other mods in my first post.