I've seen a 6-71 blower on a slant 6 at Don Garlits one year,all it would take is fabricating an adapter plate to mate the two together !! And I just happen to know such a guy !!
You could get it on there, but the 6:71 is a positive displacement air pump that, turrning at cranksshat speed (1:1 pulleys) would ram 426 cubic inches of air into that little 225 every revolution of the engine. Since it's a 4-cycle engine, it only uses 225 divided by 2, or 112.5 cubic inches of air every revolution,, you'd end up with a LOT of boost... a LOT.
The answer, would be to severely underdrive the rotors with a smaller crank pulley, but these blowers don't much like severe underdrives...
A better setup would be to find a 4:71, or even a 3:71, which would be more in keeping with the size of the reciprocating assembly (displacement.)
I think Magnusson (and, others) have some smaller-displacement blowers that would work well on a /6.
But, size IS important, when it comes to matching these pretty parts up.
A slant six and a 6:71 is not going to work very well...
