A '90s Marzocchi bomber fork will likely have been designed for a typical NORBA-geometry 26er hardtail of that era, unless what you have is some kind of dirt jump fork. So, again typically, head angle will be 69-71 degrees (w/sag). If by 'aggressive geometry' you mean something more typical of post-2010 hardtails -- long, low, slack -- fork won't be right.

So, what you should be looking for is a mid/late 90s/early 2000s 26er frame. Probably hundreds available used: Specialized Stumpjumper; Giant Rainier or XTC; Trek 4000 to 8000 series come to mind. That sort of thing.