Please be sure to post the results of the swap on our board.

Have a look at the site " 190 REV " , given the 2.6 inline 6 could be gotten in these cars a swap is possible. There may be some issues with trans tunnel clearance as the 190 generally got a 722.4 ( A smaller version of the 722.3 / 722.5 ) I'm not sure what trans your 320 would have.

There are 2 different oil pans for the M104, one has the sump fully forward and the other pushed back a few inches.

From what I recall the W202 94-00 C 280 / R129 ~ 93 - 97 SL320 has a forward sump

Pre 96 E class have a rearward, this might extend into the 96 up W210 E class as well.

A M103 12 valve pan won't fit a M104 24 valve due to timing chain / oil pump chain clearance issues.