Diego,
?
The 54/74S287 versions of the IC have the tri-state outputs. I believe Drake used the open-collector outputs part (387 suffix). You should check the Drake manual to see whether the '387 will work.
?
Either way, I recommend you install an IC socket, just in case you need to change the part again in the future.
?
Regards,
?
Mark, G4FPH.
?
