Lots of additional parts youre gonna need for that intake. Fuel rails, injectors, throttle body, sensors... Stuff adds up fast. I was at the same cross roads myself recently. While I hate - HATE the cosmetics of the vortec 2pc manifold and had a hard time getting beyond the thought of all that crap laying inside the intake, I elected to keep it. Using a Taylor spacer, doing a lil light porting on the bottom intake, doing some work with the TB and MAF and along with a 36 lb injector set up to support my cam selection.
Not an expert by any means and I am sure others will chime in but bang for buck I decided to work with what I had. Could not face laying out that much cash for cosmetic reasons.