I just picked up these covers and was wondering if I can use the old oil fill tube off the original valve cover? If so is it easy to remove? Anything to watch out for?
You won't be able to use the old oil cap. If you want to use them, the right side will be of no use to you, you won't be able to get to it at all (maybe a little), but the left side will need to have some sort of provision for a breather, or to connect to the TB like the original breather did, as well as an oil cap -- looks like push in (some are screw in) in those pics.
You might be better off just getting a set of EFI covers???