351W HiPo

I recently inherited an '82 F-150 SuperCab that was upgraded from a 302 to a 351W "H-O" in 1984 when the "H-O" first came out. This was done by the dealer as the sticker is still on the radiator support and the documents in the glove box. I'm guessing the "H-O" is mostly moniker. Anything special about these engines other than the return of a factory 351W 4bbl? Anyone know the specs?