need help adjusting a holley carb

[oldfox]

I have an old Ford Hi-Po Holley that I would like to rebuild and run on my 302.
I have rebuilt Holley's before and know how to set the idle adjusting screws in the front metering block. But this carb also has adjusting screws in the rear and it's a vacuum secondary set up. I didn't think the back barrels did anything until the engine was under a load. So,, What do these do? And how do I set them? I have checked and I'm sure that it came this way

 

[oldfox]

View attachment 245190

 

[woodsnake]

This will be an interesting thread.....

 

[fordmach70]

What list is that carb? Also is there a fuel transfer tube on the other side of carb from the front to rear bowl? That carb could be set up for 4 corner idle but i wonder if someone just added a primary jet plate to the secondary.

 

[oldfox]

Just found out what it is 68 Shelby Gt 350 cobra

I put the numbers in Google S8MS-9510-C went to a web sight called
"Ford and mustang Holley 4150 carburetors" scrolled down and there is was.
It was made for a 1968 Shelby Gt 350 Cobra with a 4 speed.- only
The numbers on the air horn and metering blocks are correct.
And yes the bowls tie together only one on the front is an inlet.
I bet I can sell this and just get a new one.

 

[oldfox]

View attachment 245120

 

[woodsnake]

I bet you are right. If you decide to E bay it, post up how you did...