30x40 from 8x10" is only a 4x enlargement.

That should be quite feasible with any 240mm lens made in the past century, whether it's coated or not.

Most of my colour photos were shot with single- or uncoated lenses ranging from a 8 1/4" WA Rectilinear (on 4x5") to a 210mm f:6.1 Xenar (on 5x7").