another n00b question... carb guys! come in!

Ok, so as a lot of you know i currently have a carbed 306....

gt40 heads, big ass cam, 670 street avenger, and performer rpm intake...

now, i'm told one of the only things still choking off my set up are my 1 5/8th inch long tubes and my ****ty ass carb with vacuum secondaries. i was told by multiple people to find a new carb with mechanical secondaries and have been looking at the Holley 650 Double Pumpers... now, my question is, would that set up be ok for a street/strip application, or should i save my money for a brand new one of these:

Holley 0-82651 - Holley 4150/4160 Street HP Carburetors - JEGS

or should i get something entirely different? i'm really trying to do this as cheaply as possible because i'm currently fixing up a car that i wrecked to sell it... so if you guys could help a brother out with some good advice, i'd appreciate it!

-Max.

nothing, i think the car runs fine... but i was told that the vacuum secondary is killing me and is choking off the cars full potential.. i was told to get a mechanical secondary carb, like a holley double pumper. truth or no?

well, to be completely honest, the thing is a monster from idle all the way up... (from a dig)... from a roll, she doesn't bog at all... like, she'll accelerate, but then start pulling hard in the later gears.. for instance, forth.. i'll take 4th and punch it at about 45-50 and she'll accelerate moderate, and then just pull real hard in the higher rpms right up until i shift...



i don't know, i just like driving my car.. it seems fantastic to me, the driveability isn't so bad for such a huge cam...

and i couldn't tell you guys what kind of cam it has because i didn't build the motor... the guy who sold me the car told me it was a comp cams x something or other, but i'm positive he was full of ****... i've also had guys tell me that it sounded exactly like an e-cam (but when they told this to me she was idling between 1050-1100 because she's a real bitch at a lower idle - almost impossible to drive at 750)... when i bring down the idle to about 750-800 she'll barely run lol.

YouTube - My 1989 Ford Mustang 5.0 LX

here's a video of the car... it's below freezing outside so it takes a while for the idle to kick down. she kicks down at around 1:09, and even then the car was idling at around 900 or so.


but anyway, back to the issue... i had one of the most trusted street racers around this area tell me that the 670 with vacuum secondaries was choking me real bad, and i could definitely see his point.... i just don't know if it'd be all that worth it to put something like a double pumper on it... would there really be THAT much of a difference? the car pulls real hard as she sits, but if i can get that much more out of it i'd jump at the opportunity, you know?

yeah? ya think? i don't know, i hope i did :/.....

and yeah, i'm sorry about my mouth - i tend to cuss like a sailor. i'll try to keep it down