dirt that also depends on if imca sport mod or a mod as here in iowa/sd sport mods here are limited to 360 ci and 9.1 cr ie. my short block the only thing right now that make my motor illegal is the top end (heads intake ect) instead of the race pan i put on a factory one. still have the cam for the track in it was to cheap to get a more streetable bump stick. i dont know if you guys have both sport and a mods there but thats what we have here. funny thing is same sport mod motor is also used in imca hobby stock. both classes mandate 2bl carb. and fact intake. sport mod can use crate if with in all but carb rule then you get 4bl and since fact sealed its dq if you open the crates