The instruction books that come with the engine kits aren't very good, but they give you a starting point.
I would say don't worry so much about having "step by step" instructions; these kits are pretty simple to install.
The real trick to building these kits is "dialing it in" once it's all put together...
Just get in there & start getting your hands dirty, & if you have any questions or problems... this is the place to ask!
And POST PICS of it when it's done! (we love pics!)
Good luck!