Man, I guess SS was right. I should have posted more info. My car is a 4 speed/4.56 rear. Gonna have headers. I'd run a 557 if it won't play Chuck Woolery and make a Love Connection between my pistons and valves. Six Pack or Performer RPM.
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528 solid would probably work well. The 557 and 509 will require a good stall (3000+) and 3.91's or better.
Also if you want to run the 509, be sure you have headers, a good dual plane intake, 750DP, along with the stall and gears, otherwise it's going to be a DOG out of the hole. TRUST me on that.
