so i would be safe using the slot system with the 11 Mhz clocking? and if my memory is say 120 ns
No, not unless
1) the interconnects are short, even at that speed a foot or two can kill you.
2) it is a 12 clock 11.0592Mhz, not a 2, 4 or 6 clock device.
3) drivers, if used, are fast.

For the purposes you state, why not make a board with uC and memory and an IIC port. You can get IIC to parallel, IIC ADC, IIC DAC and more.

Erik