Reman'd carbs. You're likely throwing good money after bad with any used carb that you haven't seen run, and will wind up spending this amount anyway.


EDIT: I wouldn't go below a 650, 700 or 750 would be better.

 

the guy said he would put it on his car so i could see it run but i dont have that kind of money right now i need a carb this weekend

 

i found a 600cfm 1 from my freinds shop thast used and rebuilt is 600 cfm ok?

 

you need atleast a 650.

 

really i have all my performance parts out of the 390 so its basicly stock right now with a cast iron intake

 

A 600 w/vac. secondaries will work just fine. I downsized from a 750 to a 600 on my 69 390 and it worked out great. And that was with headers, an intake and a 428 CJ cam. It became much more street friendly. Don't forget, the vast majority of 390's were produced with 2bbl Autolites.

 

here is the mathamitacal formula for a close size

CI X Max RPM/ 3456 =

(390 X 6000)/ 3456 = 677.08333 or in the real worl 675


The autolite 4100 carbs Ford put on these motors were 600 CFM or at least the one sitting inmy gasrage off of a 61 390 is

 

I wouldnt go less than a 650.....but its your motor.

 

Look on Craigslist everyday. Or put a WTB of Craigslist asking for a carburetor. If you had to rebuild it go to your local parts house and pay $40-$50 for a rebuild kit. Make sure you soak the carb and blow the passages out with air. It might be a learning experience.
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I recommend every auto enthusiast rebuild a carb. I actually find it enjoyable. It was one of the first things I learned to do on cars, back when I was about 13. Second thing wasn't so enjoyable, replacing the water pump (4 times because of bad ones) on my brothers '76 (?) Mustang II with a v6, that sucked.