An Amiga 2000 with an 030/25 is faster then an Amiga 3000 with an 030/25.
I could believe this if you're only using the 2MB or 4MB of RAM on your 2630. Once you fill that up and move into ZII memory boards, I can't imagine the 2000 still winning.
(unless of course you've got the super rare memory addon for the 2630, in which case you should sell the whole setup and buy a 3000 or 4000.

)