timing on nissan ka24e motor
 

can someone tell me where the timing marks must line up .

Here's a good writeup with pics- its the dual cam motor but the procedure should be very similar (check your underhood emissions sticker for the correct timing setting).

Don't forget to disconnect the TPS sensor connector when you check/adjust the timing.

https://www.nicoclub.com/articles.php?id=161707

The KA24DE in my 1992 240sx has 280K miles, has never been pulled apart and is still running strong (no smoke or knocks).