How much extra horsepower would be gained from converting to a cone filter setup instead of the clunky 2 filter airbox setup in the TPI engine (305ci)? Would it help at all? When coupled with a larger throttle body, would this give me a significant power gain?

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305IrocZ28- Al
1990 Iroc-z 305 TPI auto, Flowmaster exhaust, 2 Rockford 10'' Punch woofers w/ 160a2 amp, 2.73 rear (1650 rpms @ 60mph)