It should be a KA24. It's a 12-valve engine that works better for trucks, IMO, than the 16-valve (altima) engine that went in the '98 and later models.
My plugs require .44 gap
Yes the timing can be set.
Same side of engine as cylinder 1.
5w30 weight oil and 4 1/8 qts. with new filter.
no such relay.
No , the 2.0 liter 4 cylinder in a 1996 Mercury Mystique IS NOT an interference engine
about 4 quarts
on the positive battery cable
yes,
The intake gasket(manifold) will not match the 96 engine. I believe the 97 engine was the last year for the older style.
Nissan 240sx
The 2.0 liter 4 cylinder engine in a 1996 Mercury Mystique IS NOT an interference engine