I'm running a 302 with a mild cam. I'd go ahead and put the 66's in the primary, it'll be a good starting point for you. What motor are you running-I mean what's in it. All mine is, is a .440/.260 cam in mine, Edlebrock F4B intake and a freshening of the bearings. Put the 66's in, see how far you have to screw your air/fuel out. It it's past 2 turns go 2 sizes up. If it's less than 1 1/2 turns, go with 2 sizes down and kinda play with it until you get what you want. Double check you needle/seat for any dirt. Because even a speck will mess things up for you. Let us know!!
By the way, you have a good choice in power valve.
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