65 Barracuda 187 code!!!

Soooooo...... I wanna punch a wall lol. :banghead: This Holley i rebuilt i guess is no good regardless. Well maybe not completely worthless, but more work than I'm willing to put into a used old 70's carburetor. The primary jets in the carburetor were 68's. I didn't know that so i bought new 68 jets because that was recommended to me for my application. While the bowl was off, I blew some air into the needle area with the needle out, thinking that the mixture screw was plugged. I put the carburetor on and I had the same issue. It runs very rough and that mixture screw still does nothing. The Thermoquad i had on the car also is junk. It hesitates very badly on immediate take off, and until the car gets to about 180 degrees, it just doesn't want to run smooth. I did my research and a new Holley 600 dual feed carburetor is about $300 from summit. Before i order it, what does everyone think? Would this be a good carburetor for my engine?

Here's the link to the site with this carburetor. http://www.summitracing.com/parts/hly-0-80458sa/overview/

Oh and I got my transmission lever from B&M today. I guess that's a bit of good news lol.