I have the single 4 barrel base on my 70 cuda crate hemi ralley hood car. The base comes with a very long neck (the part that sits on top of the carb) which you have to trim to suit your needs. I had to cut the whole neck off to get the base to sit low enough. I used a steel lid from northwest (shakerhood.com). All in all I was satisfied with the product. Good luck. Charlie.