CW would have to be on 5332.0 kHz to be center channel. The new regs don't define "center channel" but current state of the art would probably allow +- 50 Hz max. What is the tolerance of those crystals and what is the drift? http://www.arrl.org/60m-channel-allocation
I use a Flex-5000 which is accurate to better than one Hertz. Most stations I hear on 60 are right on the mark. I doubt those FT-243s are going to be adequate.
BTW, 60 meter CW is often on channel 1 for rag chewing, or Ch-5 for DXing. Yes, don't buy more than the one crystal until you learn more. Plus if that ancient rig is chirpy it's going to really stand out.