Engine leakage

I have 71 240Z which I stored almost 2 years and very rare used.

recently I just changed the clutch, and bearing. After I test it about 30 minuts running stationary I found the oil came out from the clutch housing area. I suspect that it is the oli come from the engine. Maybe from the oil zeal of the back engine. Do you have any ide what it is? How to fix it? I am not professional mechanic. But I try to fix as long as it is not a big job. Do you think it is a big job to fix it?

I have another problem! After I turned off the ignition, I tried to start again. While the engine start working I smell something is burning. It was the fuse housing burning. in the area of tail light connection. I found a good story about this matter a couples guys told their problems. Thanks for this input. I'd rather buy a new housing. Where can I get it with CP? and how much?

Thanks!