the timing marks on the 4G63/4G64 are indicated on the gears, there are pointers casted into the timing cover and head, on the slinger washer behind the crank gear that has a half moon cutout.
Now when you set the crank timing mark, when you look at the mark on the gear it will be pointing at the casted pointer (or pin) which is about 10 or 11 o clock when looking straight at the front of the engine.
As for the timing mark on the cam gear , there are is a dot, it should be lined up with a casted indicator in the head which is about 9 o clock. This will be close to the seam where the head meets the block so look carefully, its easy to overlook if you're not used to doing timing on these engines.
And last but not least, the oil pump sprocket has a dot on it that should be lined up with the casted pointer in the timing cover. This mark will also be about 10 or 11 o clock.

Now according to the manual a 4G63/4G64 engine timing is as follows:
Gasoline engine: 4deg BTDC @ 740 rpms
LPG engine: 9deg BTDC @ 740 rpms

hope this helps