>>894
Ah, you're right, I had mixed up hol with the other remnants of hal (heal, hail, holy, etc) which lack the w, and made the assumption that hole was from the same root. However, the wh disambiguation is commonly accepted, it is not likely that any dialect pronounced it with the /hw/ sound in older pronunciations of "what" and "wheat" and so on, this doesn't survive in other instances of /h/ initial words and other dialects wrote it as hole even after the w was adopted.

With regards to height, do you mean the vowel shift in writing only or the irregular -t in place of -th? I can think of some other words which descend from a historical -th, such as theft. The vowel shift is unusual, I think the e was added as an analogy to other -th words which had historical umlauts.