Welcome aboard, nice to see you here too. We've got a couple guys 'round here that are very familiar with the SBC, give'em a chance to stroll along and they be sure to offer you advice in your quest of 400hp.

What is the car that it'll go in? If you're building it up to go fast, have you begun figuring out how you'll stop it?
And since I'm full of questions this morning.. what tranny? What final gear ratio?

And have fun doing the build, if it becomes to much like work, drop the wrenches and find some other way to enjoy life.
Then return when it can be fun again.