I'm probably going to build a 350 with vortec heads, eldebrock air gap intake, and a nice roller cam. What would be the best carb? Keep in mind this is my daily driver. And I hope to get at least decent mileage with it. My budget for a carb is around $400..

 

If you aren't doing anything crazy then I'd imagine that a 600 or 650 holley would do you just fine.

 

 

Would a 650 be large enough for 300-350 hp?

 

definitely. just make sure you tune it right and you'll be just fine.

 

What mpg would I expect to get? I would like to think 13-14. I usually do city driving and I like to give at little gas here and there

 

Yeah, I think that'd be fair estimate, it all depends on how you tune it and how you drive it lol

 

Vacuum Secondary or Double Pumper?

 

I was throwing the idea of trying a Q-Jet because the primaries are smaller but you need a spread bore intake for that. Even then for me it's really hard to stay out of the throttle anyways. lol
Otherwise yes, a 650 Holley.

The gearing will make a difference in gas mileage as well.

 

It has 3.08 gears. And what about eldebrock??

 

I had the 650 holley doublepumper on a very similiar engine. It was GREAT. The throttle response was night and day in comparison to an edelbrock i had ran. Try to run non-ethanol gas if you can though

 

600 cfm PN 1405 would be good for that motor. Otherwise I am not getting into the holley vs edelbrock debate

 

What kind of mileage did you get??

 

What kind of mpg did you get??

 

Edelbrock is ok too. It gets down to a personal choice sometimes. I like Holley double pumpers even if a vacuum secondary will do. Quadrajets are next and then Edelbrock for me. The next guy will probably say something completely different and some of it has to do with what people are used to as well as how well they can tune one or the other.
I'm not sure how the T-5 is geared but the rear is such that you might be into the throttle more than say a 3.73. If you have an engine with good torque and low gears you won't be into the throttle as much. That may help you stay out of the secondaries more than say less torque and higher gears. Higher gears will keep the rpm down while on the highway and that can depend on what speed you like to cruise at.

A vac secondary with a choke may be more suited to a daily driver. If you google you'll find more info on the differences. These will explain better than I can. (I'm not a mechanic or anything btw.)

http://67-72chevytrucks.com/vboard/s...d.php?t=498461
http://www.chevelles.com/forums/showthread.php?t=22333

 

Sorry about that giant Youtube post. lol

 

I get 12 back and forth to work 4 miles each way and tons of stop and go. I get a lot better on the expressway.

I think my carb could use more tuning, the car runs great but I am sure it is rich.

 

What did you do with your motor? You have vortec heads and a 650 Holley. What kind of cam do you have?

 

Generally I never get going faster than 45mph around town.

355
Patriot 185CC Vortec heads with 2.02 valves
Edelbrock 1405 600cfm carb
T5
3.73 Rear
XE274 cam
10:1 compression

 

14mpg on avg. Got close to 16 on long hwy trips. Had 308 rear end.

 

That sounds like something I'm probably going to do... You like the setup?

 

Yea I love my setup, tons of low end and really throws you back in the seat.

 

Good for daily driver? I drive around 25-30 miles a day.

 

Does not give me any issues. You will probably want a roller cam which should be smoother.

 

Holley 6210 (650 CFM man sec dbl-pump spreadbore)

Best carb ever made for a street 350

 

Ha don't worry.. I have a roller LO5 block I was looking to build on.

 

On my vortex I run a carter AFB 600 vacuum secondarys. No issues and great response.