Hey'ya, I just recently purchases a 69 Mustang Mach 1 also I am going threw trying to find out as much information as possible. Apparently there is no 351Clevland (Despite what sites say) read RPM Tachometer post by me and it explains moree about it.
Check out
http://www.vintage-mustang.com/topic...de/decode.html
for more information on decoding your Drivers Door Plate Tag.
Hope this helped abit.
Sam
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1969 Mach 1, 351-4BBL Windsor, 4 Speed.
Moving At The Speed Of Sound.