Good to know Jon, thanks for the links (and for commiserating.) I’ll be signing up at jaguarforums shortly.
Regarding the $1000 radiator vs the $250 one, I suppose for sake of completeness I should note that mine is for an automatic transmission, while the other one is for the manual gearbox. Apparently the $1k one has a transmission cooler incorporated, or something, which could bump the price but why it would be worth an extra $750 is baffling.
I realize that vintage cars cost money to update, but when I see prices like that for a radiator it’s a real motivation killer. With luck the folks at jaguarforums.com will have suggestions equally as good as yours to help keep costs under control.