Reply to Re-Edit help: getting new drums to sit with track

Hey everybody, so I'm a huge fan of old tracks and would love to have the ability to throw on my own drums to make it more club friendly. I'm struggling with have my drums sitting with the old track. I hope this makes sense but whenever I hear other people's re edits it sounds as if the drums are fused with the old track, where as whenever I try doing it you can tell the drums are separate from the old track. So how can I glue these things together.