I bought an edelbrock gear drive for my 302 came with full instructions easy to fit. You have to grind a little piece off inside the timing cover. I don't use it any more I read somewhere they use about 15 - 20 hp
I used a Dynagear drive for some time. Engine ran for about 3 years with very little maintenance at the strip, but developed a mysterious bog off the line. Changed everything, went back to what I started with, but changed to a timing chain instead of gear drive. Not only did it run fine again, but it also picked up .3 second! who would've figured? Seriously, it was very easy to install, just had to grind a casting off the inside of the timing cover. It was easy with a Dremel tool. That's all that was required. Man, that thing was noisy!
Easy install, noisy as hell. Hope you like driving around sounding like a blower car. Had a friend that put one on his Cama@* 350. He lasted about 2 months before going back to a chain. You could hear him coming 3 blocks away.
I use a Rollmaster True Roller double chain on mine. My father used to run a gear set in his 77 Falcon Ute on a 302 and it sounded funky but that was about it. He lasted about 6 months before he went for the chain.
Hey Bullet, I also had gear drive on two of my cars. I was 19 years old and then again when I was about 25. One was a sbf and the other was a 350 GMC truck. Pete Jackson it was. Super bitchen at first and then you see some of the guys laughing... People that know their stuff know"it is not all that". I did love it in the beginning and was proud of the way it sounded but that was then. I say If you want to test It out " Go For It " Enjoy It like most of us did back in the day. Just keep a open mind about everyone's advice.
I had one in a 351w. Like everyone says they are very loud and after a while you get tired of them. I had 3 inch pipes with two chamber flowmasters and you could barely hear the exhaust over the gear whine. They do however make really quiet gear drives now that sound really cool. I however would run a double roller chain. The gear drives are a bitch to time but when you get them set they stay set really well.