Need someone with '68/'69 A-body rad experience.....

Why do you need a shroud?
good point! I just assumed he was having some cooling issues and wanted to keep things looking original but to be honest, on a 273, there's a good chance any decent radiator upgrade will cool that car down even without a shroud. If it had AC or was driving around town in 90+ temps often, then I'd probably recommend the shroud.

So what's the motivation for the shroud? :)