Gentleman , I have a potential project in mind .

background information- I have a bastardized '72 280se . This unit is a rough regular driver. drivetrain is all gm. small block v-8 with turbo 350 transmission , 4.08 rear
Exterior is rough - minimal rust
Interior - nice seats , no heat no a/c no p/s
no radio , needs headliner etc
all lights work , wipers
a fun car to drive

I 've recently come across a wonderful example of a w108 . 1972 That the motor( overheated ) was taken apart 21 years ago and never put back together. Its been in a garage so paint is fine , rust - non found yet. Interior is nice all there .$750

I m thinking of swapping my motor / transmission from my w126 - 89 300 se The m103 / transmission.
The 89 is a nice car - however it needs $800-1200 in front end work . Tires .
No a/c . I d hate to strip it out - yet I'm not inclined to put much into it .
( whats it worth $1200-1500? )

Any thoughts on what I'm up against - fit / finish / drive quality ?

I 'm not a purist by any means , not concerned w/ resale or future value .
I like the idea of older cars , perhaps a more reliable ,updated drive train.

Any input would be appreciatted