Yep the Holley Street Avengers are a great 'out of the box' carb for the most part, I have one on a 245ci 'Hemi' straight-six in another Valiant and it loves it. Only thing I had to weak was the idle (a tiny bit) and the power valve - just one size earlier (higher vac) than standard ended up being perfect.
I tend to time at idle, then turn the idle down, then advance the timing again followed by an idle down adjustment. This usually gets you where you need to be. If it makes it hard to start when hot (say you took timing to 16BTDC at idle) then wind it back 2 degrees and see how you go from there.
Cheers - boingk
