picked up a 340 long block w/out specs

Man you guys must be either rich or lucky.

No way I'd take an auction bought engine and just toss a blower on it and see what happens. I mean, what's the worst that could happen right? Oh yeah, blow every piston out of the hole with massive detonation because you have no idea what it's set up for or how to tune it. Or waste a few hundred bucks and all the install time buying a regular carb intake and running it only to find out it really was set up for a supercharger and it's a complete dog because the compression is 7.5:1 and it has a blower cam.

I mean seriously. This engine is on a stand. It shouldn't take more than a couple of hours to pull the heads, inspect everything, CC the chambers, and button it back up. If that's too much time and effort, just imagine how much fun it'll be to have to yank it back out and tear it down because something broke?