Joe,

You might do well to post this and other questions about your car on
alt.hi-po.big-block-ford-mercury. Your car and engine is definitely
on-topic over there. There are lots of folks with lots of expertise with
this stuff. I wish *I* had some to give you on this specific question...
good luck, regardless!

--
Wound Up
ThunderSnake #65

"Joe" > wrote in message
oups.com...
>I have a 1972 Mustang with a 351C, 4-V. I'm replacing the stock
> Motorcraft 4300D that's on it with an Edelbrock 750 cfm, because the
> Motorcraft float is screwed up and the secondaries are frozen shut. As
> the car is now, it won't start with the stock carb. I need to
> determine if the distributor vacuum port on the stock 4300D carb is
> timed (no vacuum at idle) or full (vacuum at idle). Since I can't
> start it with this carb on it, I can't do a simple vacuum test. Anyone
> know if this car has either timed or full distributor vacuum? Thanks.
>