Carb question...

[cjm]

I have a 70 cuda with a 73 340 in it.. The engine is pretty much stock, but it has headers and a new exhaust (magnaflow 2.5 with and x pipe) (4 speed with 3.23posi)..  The thermoquad that is currently installed is leaking from the plastic body and definitley could use a rebuild..
I would like to put a different carb in it and was thinking about a holley 750 dp..  The Holley's are square bore and the manifold (stock) is a spread bore..  I had originally thought about putting an adaptor so that it would accept the square bore, but was advised not to (i was told --the same amt. fuel will not go to all cylinders???)  Any thoughts or suggestions on this or a different carb suggestion???  I'm not interested in racing but would like a little street power....

Thanks in advance...

[Bluemonster71RT]

I have and like my Holley Street Avenger 670. I ended up putting larger jets into the 670 till I got it where I felt it was best. It ran great and the throttle response from it I had not felt in the car before.  As far as the adaptor goes I'm not sure how bad it would be as far as not the correct amt of fuel per cylinder. In theory I can't see a issue but actual usage idk.

[Chryco Psycho]

the Holley 750 DP street HP series carb 82751 is an awesome carb , I would look at the RPM air gap intake with it

[cjm]

The 82751 doesn't have the choke, correct??  .....  I never had a carb that didn't have a choke. How will this affect starting/driving in cold weather, etc....  ?

[Chryco Psycho]

What kind of cold weather , I have no issues with these carbs in typical summer driving , but I don`t try to start them outside at - 40

[Oldschool]

The 82751 doesn't have the choke, correct??  .....  I never had a carb that didn't have a choke. How will this affect starting/driving in cold weather, etc....  ?

I am running 2- 750 HP, DP carbs. Both are sans choke.  No problems.  Like Chryco, I haven't ever tried cranking the car in extrene cold, but I have cranked it in 30-40* weather with zero issues.  Simply pump the gas 3-4 times and wait about 15 seconds for the fuel to vaporize a little and hit the starter.  Fires right up.  In cold weather, I sometimes have to "feather" the throttle a little until the engine/manifold gets a little heat in it.       

[cjm]

The coldest I would be driving it would be about +40(f) but I like to start it occassionaly in the winter time (Connecticut)... I really didn't know if it would be a factor without a choke...

Also, the Edelbrock has the RPM & the RPM Air Gap. It looks like the Air Gap keeps the manifold colder. Does this give a significant increase in horsepower?

[Chryco Psycho]

the Air Gap is the better intake for sure & yes it stay cooler & helps power
 big block have always had the Air Gap , no idea why it was not copied on the small block which were designed later

[cjm]

Thanks.. I will give this setup a shot...