All i can find is that it's a replacement smogger engine. Most likely mid to late 70's. Low hp, low compression, cam so small it might as well be round. You'll have a hard time making 400 horse with it as is. A simple cam swap with a good intake and exhaust will get you there or very close. Maybe a little head work too.
Not saying it's a bad motor at all, it's a good starting point for a build actually.