Conventional wisdom has it that the Torker is better for higher RPM, the Performer is better for what you are doing. Timinator is on record saying that the O4B is the best for your ap if you can find one, and whatever you get to block the crossover.
If and when I change my stock iron intake out on the Olds I will go with the O4B. There are a couple on fleabay right now, they are both painted though.