3200 Turbo Action 10 tight ,on mine.. and to be honest 27 inch drag radicals really need a 3:91... Throw in together, with the 3:55 's ,see how it reacts. I did a Air Gap , E.Q. heads ,and a 110 lobe center h.d ,on similar 380 /360 crate spec. It's not a smooth 112 242 /252 rat solid lifter cam ,4 sure.