The chain sets are the same. With some of the double roller sets you will have to grind a little off of the thrust plate. You will also need to watch the length of the cam dowell pin. Depending on whether or not you use the fuel pump eccentric and which eccentric you use and the combination of the gear and cam you may have to modify or use a different length dowell pin. Make sure the pin isn't too long and not allowing the cam gear bolt to properly tighten the cam gear. Don't worry about the chain being close to the block, it will run a lot closer than the stock chain because it's wider. There is very little end play on the Ford cams and it won't get any closer than what you have when you build it.