Though, with missing/inactive hardware they should disipate less heat and for any given cooling solution you might be able to get a higher clock? No?
Maybe. Depends :
a) If an integrated FPU uses clock gating when not in use. This technique was used even back then.
b) Depends if you have a REAL EC/LC chip. i.e. Mask G59Y.
Most EC/LC parts I've seen used in the Amiga are actually full 060's which failed quality control in the MMU/FPU and are marked up with a different designator on the package. These will output the same heat as full 060's
A lot of EC/LC parts were sold as full 060 parts by wheeler-dealers trying to make a quick buck. Test it for a bit and if it works sell it as a full one. A-kin to opening up gfx pipelines on gfx cards.