Revell kits can certainly take some, ah, patience in dealing with fit issues. Revell is actually one of the more inconsistent manufacturers out there- some of their stuff is rather good, and some rather isn't. The newish F1 kits (since '05ish) are supposed to be a real improvement over their older F1 kits, but that's not to say they will be trouble free.
If you can post some pics and descriptions of the bits you're fighting with, maybe we can offer some help.