don't know why you think the 3.6L is unreliable, mine has over 100k with 0 problems. Of course the RT folks know more than the average builder.

Be wary of the 3.0 M104 CIS hybrid in terms of parts availability because they were only built 2 years before they were replaced by the more common 3.2L M104 engine. I'm not sure if you'll need it but there is also a rare / expensive EZL involved. I was going to swap my 3.6L M103 in to my '90 coupe because it still used CIS.

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'88 300TE, 175k, black RENNTech 3.6L Recaro C's AMG 1 SOLD
'92 500E, 110k, Spruce green, stock SOLD
'94 E320 Cabriolet, 130k, E500 wheels, Emerald green SOLD
'94 E320 Cabriolet, 110k, black, stock, SOLD
'88 300TE, 229k, dark grey, SOLD
'90 300CE, 212k, white, new paint, SOLD
'91 300E, 209k, white, rebuilt head SOLD
'74 914-6, grey, 2.7L 325hp twin turbo Audi conversion