OldSynths

Hi:
Can someone advise the best way to desolder chips from a circuit board?
I am working on my CS-60 and want to replace 40xx chips with new, but 
dont want to do more damage than good.
I will be putting in sockets in their place to make repair easier in 
the future.

Is there a good method or desolder tool that heats the whole chip at 
once?
The only other way I know is to clip off the leads, remove the chip, 
and then desolder the remaining pieces of lead from the board.

Please advise (Crow??)

Regards
Rory McDonald
OLDSYNTHS MODERATOR