Try Macs Antique Auto Parts in NY.  They have a catalong on Torino
parts. I use them for part for my 56 and 53 fords.

macsautoparts.com

There are at least two problems with horsepower ratings. The first is that the
methods for measuring HP have changed frequently over the years. The main
problem in the last 50 years or so has been that manufacturers are not required
to be even remotely honest about the ratings. In periods in which power has been
felt to be a marketing advantage, they have frequently overrated the engines.
There have also been periods in which insurance companies have charged high
premiums for big engines; during those periods, big engines were underrated.

I would bet that the 330 hp is the manufacturer's original horsepower rating and
the 300 hp is an accurate measurement using modern standards.

George Patterson
    If you torture the data long enough, eventually it will confess
    to anything.