aha! you have an advantage that the Warp Engine has a pretty rapid ram controller as well. faster than my old cyberstorm2 if I recall....
although Phase5 stuff did really well on emulating the 68030 bus cycle so the chipram access on the cyberstorms was always a winner... anyway I digress.
warpengines would usually came with a 28Mhz crystal to give you a modest overclock boost as well, but I think there was a bottom pricing tier where the warpengine came with no CPU and you had to pull the one off your A3640 - so it was an overclock from the get-go.
I managed to take my warp engine up to a reliable 40Mhz just with a crystal swap and an AMD k6-2 (what I had laying around at the time, back in the day) heatsink+fan combo. I still have the 28Mhz clock chip somewhere...
if you want to go the full 060, then you're in a good place, as you can probably plop in an adapter, and get 50Mhz off the bat with that 25Mhz clock. up to 80Mhz should be do-able, but more than that, and your memory controller, while a fast refresh, may not play so nice as it won't be able to keep up at faster clocks.
060's usually retail for £$100 from what I've seen, but I managed to get a few G65V mask 060's from china (ebay) for a knock down price - that actually tested and work!
040 to 060 adapters I've seen for quite stonky money, but considering each one is usually a hand made, I get it. But they are still probably your best option as an actual 060 card these days is silly money.
but as always, your mileage may vary, and yeah, i'd be on ebay to get some more ram
