Wonder why nobody's speaking up?
I guess you can get today's weights off the manufacturer websites. The JT4A-11 with 17500 lb sea-level static thrust weighed about 5000 lb, and the Conway (about same thrust, as used on DC-8-40 and 707-420) was around 4500 lb. JT4A diameter 43 inches, about the same as a JT8D.