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[V-SLR5000-P]

Years ago B & M published a Supercharger Technical Manual which covered mini blowers with dyno testing at different levels of modfication. I think this manual is well out of print now, but you can still get Pat Ganahl's Street Supercharging which is a good read.
B & M testing produced 320hp from a stock 350 witha 144 size blower. Head and cam changes saw maximum power of around 420hp with a 144 and 460hp with a 166. Without knowing more about your motor and set up its impossible to know what it will produce. Fuellie heads are no longer the ticket to high performance but will suffice for mild upgrades.
In addittion to forged internals (low compression upto 9:1 absolute max) the engine should have a regraphed dizzy without vacuum advance, pressure diversion valve hooked into the vacuum modulator on the gearbox and decent fuel supply. Holley blue, Mallory 110 or 140 will get the job done.