Advanced Auto has a double roller chain for around $25 thats made in the USA. I used it and checked my new cam install centerline and the chain was spot on. Now if the factory cam is ground at the proper centerline is anybodys guess unless you check it. I had to exchange my Lunati vodoo out because the first one I got was 6 degrees out on the cam which would make you need a 3 degree offset at the crank. I didnt want to spend the money on a key set so I traded it for another one and that one was almost spot at 106.5 degrees. If your just a little bit shakey on just changing the timing gear set checking the centerline might be a little intimidating for you possibly. Might want to grab a local friend thats done it before to lend a hand the first time around. Good luck.