invader motors?

[81k5]

Just like to say hello to everyone, I stumbled across this site and seems like there is a lot of good info here, so hopefully someone can help me out.

I have been searching for the last couple of days and all I can find is a site on the GMC Sprint in reagards to an INVADER 350. I just purchased a 350 invader on the weekend. I have never heard of one untill I saw it. From what I can gather they were made from 71-77 I believe, but thats all I can seem to find. So if anyone knows for sure what years they were made, what kind of horsepower they made, are they a good motor? Are they rare? Were they all 4 bolt mains(so I was told) or if you know of a link to a site it would be greatly appreciated. The fact that I cant seem to find anything on them really makes me think they are rare. Thanks