94Ram,
If it is the stock pump on 94 a manual trans then it should be a 175 pump. Best to remove the throttle linkage on the left side of the pump and check the id numbers on the pump under the #2 delivery valve holder. Then you could be sure what pump you have. The 160 pump will work fine.
Jim,
Do you realize that if you lost #1 and #4 you would still be 580 HP :-laf
Dave.