OK.....I just spoke with the man himself Mr. Langdon he called me and he is a very nice person. I have purchased the mini unit with round coil. His GM HEI unit would also have worked with some modifications due to the gear and oil pump hook up. All of Mr. Langdons items can be picked up from an auto parts store and he provides instructions and you can call if you have any trouble with installation....it don't get any better than this folks....THANKS Mr. Langdon and thanks to all of you guys for all of your help and guidance! Steve