Hi Yuta, and welcome to the forum.

I have a 1990 4G64 so I might be of some assistance. I have a thread about the work I did on my own 4G64 that you can cruise through for answers and photos, if no one else helps. http://www.mightyram50.net/vbulletin...G64-5-spd-D-50

You'll want to set the timing belt before you re-install the distributor. Set everything to #1 piston at top dead center, ready to fire. This means the cam will be in a position for both valves to be closed, the timing marks as illustrated in my thread (note the mark on the cylinder head, NOT the top of the cylinder head). Once the belts are secure, the distributor should be pointing down, just past the distributor clip, #1 position on the cap. As I said, i provided plenty of photos for all this, you just might need to take some time going through the thread.

I sure hope this helps you.

~Roy