I have to pull my engine this weekend to fix an oil leak that I suspect is the rear main. And I have to fix an exhaust manifold bolt that decided to fail and I cannot get access to it in the truck. Figured while the engine is out, I will change the cam, and do a few other things so I don't have to do anything but preventative maintenance later on. I bought a timing set years ago when I bought the cam kit. It is the stock style but has cast gears, no plastic teeth. I was going to check the numbers at the parts store when I get my other parts, to make sure it will fit my 81 block. The pics I have seen of double roller, they don't look as strong as the stock type. I know they made them for a reason, I just cannot recall what the reason is. If the one I have will work for my set up, I will use it. But I am asking for pros and cons for each before I buy a double roller if the stock one I have won't work.