[CSX 4027]

So you really want to only drive in circles in order to feed all the cylinders evenly? That's what it was designed for. Truly just a legendary buzz word as opposed to functionality. Part numbers? Some C6...... or C7.......and some had none. I would look for a no part number straight up 4 barrel. Try Perogie. They are expensive but, they usually have what you want.
PS. If you are cloning, are you aware that the hole in the hood was actually offset 1" to compensate for the motor not being dead center of the hood? The sidewinder brought it back dead center but had the unequal length runners.