im going thur the same issue right now!! what to build for a motor for wheeling. my conclusion biger is better. displacement is king!! im going with a 350 sbc and a turbo. you want the torque but hp is also needed.
I have never run a street avenger , but have had great success with all of the holleys i have owned over the years. My favorite is the 600 with vac secondarys.i have also run an edlebrock and did not like it.