thanks, nice to see my question isn't dead!
i've concluded i'm not likely to find a 'correct' radiator even if i do sort out what the means, so an extra-deep standard pickup style is on its way. i'll let everyone know how well it does or doesn't fit, but it's going in no matter what.
if the break is between 3000 and 4000 series, i'm hoping it's just deeper, not bigger. anyone got a 'smaller' 4000 series Task Force around? either way it's going in, and i'll post more info and pictures of the ugly beast once i get it driving and home.
20 min north of the nations capital, right in the middle of town. won't i be popular with the neigbhors...