Which Holley is Best for Me?

[jmking9]

I'm about to put a new carb on my truck and am looking for a little advice from the Holley experts (because I'm FAR from one of those) After a lot of reading and talking to a couple different guys that have experience with Holleys, I've got conflicting info. Would a mechanical, or vacuum secondary carb be best for me? I went into this thinking I wanted a 650 DP. But after doing some reading, I'm wondering if the 670 Ultra Street Avenger would be a better choice for a street driven truck. I wanted to hear some opinions or advice on either one of these or even something else that would work better. I'm open to suggestions. Here is a few of the specs on the engine/truck
*355 ci with 9:1 compression
*Edelbrock RPM aluminum heads
*RPM air gap intake
*Comp XE 268 cam
*Auto trans with 2000-2200 stall
*3.73 gears
*5000 max RPM
*Currently running a 600 Edelbrock that performs "ok" I'm putting this carb on my jeep and hoping to find something that performs, and looks a little better for the truck. I'm really wanting to give a Holley a shot.

What are your opinions on a carb for this setup?