FWIW, connecting rods usually fail from inertial forces. To help rods survive, keep the RPM low and use light weight forged pistons.
Have the rods professionally reconditioned so the big ends are round and the center-to-center length is the same.
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(let's assume no decking required)
And we can assume this why? Every I8 Packard head and block we've seen benefitted from having the block deck squared to the crank centerline, then order the custom forged pistons with a pin height which will give zero deck height.
You must have your reasons for choosing Stromberg 97s for your carbs, but those are not what I'd recommend to be pressurized. The Stromberg WW, as used on the supercharged '57 - '58 Studebaker Golden Hawk, Packard Hawk and '57 Packards would be my choice.
As to the question of the 5-main versus 9-main block choice, there have been so few supercharged endurance racing Packard I8s built, the experiences are not numerous. However, it's difficult to argue against a stronger bottom end.
jack vines
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