You didn't mention what hacks you have so it is hard to say what you will have to do.
For any hacks which required code modifications you will have to re-hack your vbulletin files to make them work again, also template chages for those hacks as well.
I would recomend you check for the newest release of the hacks you use, download them and read the install directions. That will give you a good idea what is involved in your upgrade.
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