hey mick you might need an ignition you can map out the curve,the gm delco module can be changed,,i wonder if they will work on four cylinders?,its the same module on v6 and v8 you select options once your in with a lap top,you can change firing order etc,,these are used on flat head ford v8s even,if they can be tweaked for four cylinders,it would be an interesting project.,use it just for the ignition part.i had an article on them somewhere ill see if i can find it.