Wasn't there an old-timers game at RFK back in the day where they didn't reconfigure the football stands? Seems like the right field fence was at some ridiculously short distance...like maybe 230 feet.
I think that was the LF fence. When configured for football, the "bouncy" stands would roll out from underneath the 3B-side stands. At some point, probably by the late '70s, the stands were rusted into place. Nobody bothered to un-rust them while baseball was on "the long road-trip".
DC / RFK Stadium was always about 325 or 335 down the LF and RF lines. That was considered a short-porch compared to Griffith Stadium.