what do the rules say about if you were to run a 2.3 and mill the head way down( say 11:1/12:1 cr)? The 2.3 n/a with a carb can make 250hp pretty cheap with factory parts and in a 2500pd fairmont it would do well plus they are foxbodys with a longer wheel base so you can upgrade brakes and sway bars with factory parts and no body would be the wiser....