Too much intake? RPM Air Gap on a stocker 360

I ported a 2176 performer intake manifold to thr 340/360 gasket size. I see the horsepower drop from the rpm to be about 25 hp, but I hoped the porting narrowed that down a bit.
Also, buchillion? makes a kit that uses a "shorty" Sanderson compressor and related bracketry, see attached photo

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