I would pull the 2.73's in favor of 3.08's or 3.42's. you can get used gears on ebay cheep cheep (I have seen as low as $15), and new gears on the internet for low$
My experience with 2.73's in a 2000# car was nice, however in a 3000# vehicle, they were a little much on grade. The 3.08 were nearly perfect. A 3.23 gear would be really nice, however rare for GM, more common on other brands.
Get a 4-barrel intake, again, cheep from salvage yards, and cheep from the internet both used and new. For a carb, I am partial to Holley over AFB's and Q-jets. I like the 390cfm for smaller motors.
Just my two cents.
