Agarian
Guest
I used to have an '84 M3 and traded it two years ago.  Today's market is a different ballgame so I can't help you much with the price.  Mine was well taken care of and brought about the same as simular age and houred 6620 Deeres  (M3 was a much better machine).  The engine you are looking at is likely the 301 turboed and intercooled allis engine: very close to same as that of the 7020 Allis tractors.  later M3s used a 158 hp 426 Allis engine, but never had the sheet metal of the N series: a completely different animal.  An interesting thought, the M3 only cost a thousand more than a 4420 Deere when I bought it.   Market forces may be different in your area.