Those 2 skinny little Gates belts slipped pretty badly with a Rossi .60 on there..You probablywon't be able to keep them tight enough with a 3.2 on the nose, much less start the engine at all...The later PurrPower had 2 mounting points and could be adapted to a Q 75 or 3.2, and would hold the weight of the larger engines much better than the little aluminum tube bolted to the light firewall....
Check out the reduction drive for a G62 on Mick Reeves' website...Way better....
One of our USRA pylon racers had a 5.8 Sachs on a Nosen P51..something that size could easily handle the 4 blade prop without any reduction drive.....
I think Iron Bay Models has pictures of the Byro drive and/or PurrPower...