You're right about the mini starter, I have it and forgot to mention it. On a stock engine, it will probably drop in the low rpm range like postal said but it'll make up for it in the upper range. It'll be worth it so I think you could go ahead and swap it, especially considering they're free... wish I found that deal. They are overkill on a stock engine but they'll make any future mods really shine. And yes, you will need at least 6-8 inches. And be glad you have the 5 speed. I put them on mine and I have the AOD... I had to pull the engine to put in the driver's side and then the tranny to put in the rider's side. I do have the 1 3/4 but damn. But once in, they're worth it.