I recently bought a 91 EF9 si and it started having problems.. so i checked it out and found out that, first of all, it was a sohc ZC motor .. and the problem is that the cam/crank seals leak oil.. alot of oil.

So my question is.. should i go ahead and spend money to fix the leaks? or just drive it with the leaks untill i decide to swap it (b16)? the motor is said to have 135k miles. swap or fix?

 

Depend how deep is your pockets.
And how good are you replacing the rear crank seal.
If you do it yourself then I would say fix it.
If not then I would say swap...
Because the shop is going to charge you a lot of money..