I'm not totally certain on blocks, I'm sure the .98 M104 and M103 blocks are VERY similar, hell my .98 CIS motor still has an M103 block casting number. The .94 and .99 104's deviate quite a bit from the .98 motor including the front chain tension which is totally different. My qualm with the .94 M103 is that it has a much smaller bore than the 3.0L motor. Usually companies will cast the walls with about the same thickness, so with the much smaller bore, you will not have room to make it to the 88.5mm stock bore of the .98 3.0L motors. I'm not certain of this though, so if you get the blocks sonic tested you'll be able to tell whether or not you can punch it out that large.

The original 3.6L AMG M104's used .941 coded blocks off the C280 engine line. These blocks were identical to their 2.8L counterparts in block castings, they were just bored to the max 91mm. To get 3.6L you'll need to get a 350SD 92.4mm stroke crankshaft and a 91mm bore. 3.5L is obtained with the same crankshaft but the 89.9mm stock bore of the .94/.99 M104's, 3.4L is obtained with the same 350 crank but the stock .98 bore of 88.5mm. 3.2L can be had in M103 form by using either the 3.2M104 crank or the 3.0L OM603 crank (both are 84mm) and an 89.9mm bore. Using the 84mm stroke in the 88.5mm block will net you 3.1L. I think that's all the non-standard sizes I can come up with right now. Oh wait, the stock 80.25 stroke with a .99/.94 M104 89.9 mm bore will net you a displacement of 3.05L

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1993 190E 2.6 Sportline