I like the Vodoo 220/226 @.050 475/494 @112cl on my stock 383rr, with 915's and 9.7cr. lots of vacuum for PB, pulls hard on the low to mid range, buddy with a mostly stock 70 440 cuda was surprised how it kept up with him. I was very carfull not to give in to the bigger is better cam picking, especially with the 383.