Hey Ken,
The Aeromarine hull was notoriously heavy overall, and most were quite tail heavy. The battery weight forward has been a benefit for the FE guys I believe. Hey - - that was pretty Politically Correct - - - Very rare for me.
Using OPS 45, I would recommend you not hang tail feathers on it, and try to keep it as light as possible to enhance the OPS's performance.
Nothing wrong with OPS 45 for power, and the price is much better than new engines. You have one so I'd run that puppy.
My partner in Florida, ran the disk valve version - not drum valve newer one for many years.
He went to a difterent engine because the 2005 P/S set porting for the engine was changed significantly to include additional boost port cut into the piston and sleeve from the original configuration. This new porting seemed to like a PICCO carb with a .400 bore, better than the .430 bore Picco carb used with the original porting configuration. This prompted my partner to try the Picco blue head EXR, which we were unable to get repacement crank shafts and other parts for - - so Jack sold off all the PICCOs he owned , moving to CMB RS.
Jack had good results running the OPS 45 with a MACS/Prather Muffled Marine pipe, X 450/3. CHEERS !!! Bob