picked up a 340 long block w/out specs

I recently picked up a 69 340 long block from an auction. I couldn't get any info from the owner or even know who he/she is. All that was stated was a "69 Mopar 340 high performance 400hp supercharged race engine". It has roller rockers, electric water pump, and has the lower blower manifold(looks like it was never ran). I know the stock CR for these engines are 10.5:1. Should I just go ahead and throw on a 671/871 blower assuming the compression ratio is built accordingly, throw a regular intake manifold on it and run it without boost and enjoy it for it is?, or go through the hassle of pulling heads and calculating compression ratio? I'm guessing the correct route is the longest one and pull it all apart and check it all out myself, but just seeing what you folks think...

TIA
-N