how about this?
 

Hi there, I'm in England UK (not that that's really relevant) and I have a '72 convertible which was originally a 351 cleveland but is now running a '75 (or thereabouts) 400 cleveland. It seems like a strong motor and properly fitted, anything you think I should watch out for?

Steve

PS Over here I see another mustang on the road perhaps every six months or so!!

Actually this 400 engine is from the cleveland family but lacks alot of the power. It has a lower compression and has about 180 HP, it should not give you many problems especially if it is mostly stock.
That being said it has alot of growth potential and with a good cam, intake and heads can really perform. The 351C heads are a bolt-on improvement.

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69 351W Sportsroof deluxe