Twin 40's weird noises

yo

stuck a set of twin weber 40's and a 421 manifold onto my 8v and ever since i got it runing, at about 2000rpm, it sounds like i have a serious hole in my manifold. A loud exaust tone coming from the front of the car that sounds like an engine being run without any exhaust.
this noise is only present for a range of about 200 rpm and while lower or higher than 2000 the car sounds great.
I thought maybe my exhaust manifold was coming loose, but all the bolts are tight

Is this a normal sound to hear when running twin carbs?

Cheers

Could just be quirk of your set up dude.

What 'zorst are you running?

My old pug used to resonate like hell at a certain rpm, you just have to get used to it and avoid it!