1978 Chrysler Le Baron Slant Six powered. Would you buy or not?

These "M-body" cars are just gussied-up F-bodies (Aspen/Volaré). Yes, they are slugs; they are heavy cars, with tall rear axle ratios, and crude, power-sapping emission controls. The 2-barrel "Super Six" 225 is a bit less sluggish in them than the 1-barrel version.

Chrysler's quality control at that time was piss-poor. Most of the badly-built ones went away long ago, leaving only the relatively well-built survivors, but with 29k original miles, you don't know which kind you'd be getting.

Whether to buy it depends on the usual factors, plus what you want to do with it. Buying it as a fun hobby car is a whole different prospect than buying it as a daily driver.