See whether one or two of the Jags or Healeys are worth something and make him a package offer which also includes hauling away the MBs. At least you "might" get a worthwhile car out of it. Does not sound like the MBs are worth much.

I passed up two Jaguar XK150s (one being an S version) in a barn like that 20 years ago and still kicking myself a bit.

Bert

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'70 111 280SE/c 3.5 (4 spd manual) - sold
'63 MGB
'73 MGBGT V8