Heh. Haven't dated myself since I was a teenager. Har Har.
Yep, those be cross ram manifolds from a 1963 Chrysler 300J, 413 CID V8.
The manifolds first appeared in 1960, standard equipment on the 300F. A Carter AFB 4V carb was mounted on each end of these things (8V total). They snaked across the valve covers and mounted to the intake ports of head on the opposite side.The big plusof this setup was that it packed a real wallop in mid-range torque. A similar arrangement was also available on DeSoto, Dodge and Plymouth V8s (383 & 361 engines). The 1960-'61 engines were "long ram" versions, with 30" runner length. In '62, a "short ram" setup (with 15" effective length) became available, which moved peak power further up the RPM scale. Externally, these manifolds looked similar, but the shorter effective length came from cutting the dividers further downstream from the carbs, rather than having the tubes divided for the entire length of the manifold. The car in my profile pic has the "shorter" version installed on the engine, and the unattached manifold is the long version, shown for comparison (both setups were available on the '63 300J).
Great article about these intake systems can be found here: http://www.allpar.com/mopar/sonoramic.html