Ford 300, ford 1.9l sohc, gm 3.8, ford 460, mopar 360, ford 302/351, mopar 318, gm 4.3vortec, gm 5.0, gm 5.7.
In that order.
ken
p.s. a close friend of mine is part owner in third generation auto salvage parts yard. they got tons of good and bad during. "Cash for clunkers" the government required them to put some death in a can in motors and transmissions. five minutes if that tops motor siezed tighter then a virgin on her honeymoon. that a ford 300 powered used and abused half ton 450k on clock, dealer tried to kill it no death. my friend dumped the coolant, ran 15minutes, drained oil out restarted and ran over 15minutes before bang. that's nuts. hands down the "300" is bullet proof.