The 260, 289, 302, and 351 are the same block. They're damn near bullet proof too. My brother threw a rod at 5000 RPM, and it didn't pierce the block. Take a 289, add 20 years of technology and out came the 5.0.
Personaly, I don't think anyone can complain since I see people swaping Chevy and Ford engines into Nissan's and Toyota's, which i'm sure the Japanese aren't too fond of. Hypacritical.