351 W came out in 1969, in the Mustang. 351 C came out in 1970, in Mustang. The 351 M is a different animal, found in 1981 - 1992(?) trucks, Broncos and large some sedans.
You could, can and will find the 351 w in just about everything Ford made. Happy hunting. Old vans, LTD, cop cars and taxi's are all good candidates.
351 W were installed from 1970 - early 1997; until the mod motors (5.4 Liter) came out..somewhere around mid-1997 (?).
<font size=-1>[ This Message was edited by: Beoweolf on 3/28/06 11:10am ]</font>