There are very few H's out there still making factory HP numbers.
When an H's engine is rebuilt, it is rebuilt with modern materials, modern tolerances. Overbore sleeves are installed for more cubes. The head has probably been planed multiple times over the years, increasing the compression ratio. Domed pistons are used, further increasing the compression ratio.
On a fresh rebuild, an H should be producing well into the 30's for HP.
Conversely, a 340 engine is about as tweaked out as you dare make it. There's nowhere to go to further increase performance. You're stuck with factory numbers.
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