Fascinating! I'd imagine that a fully operational land-based system, being entirely free of volume constraints, could accommodate a much greater number of missiles in fully assembled format (possibly even all of them) and more guidance-illuminator sets for a much higher rate of engagement.
Have to admit, though, I'm not sure I like the thought of a nuke-on-nuke engagement using an air-breathing missile as the interceptor vehicle. Was Talos's altitude capability really good enough to lift a powerful enough nuclear warhead high enough to avoid collateral damage? Over the sea it doesn't really matter so much; over sensitive targets, some of which may be civilian, though, it's another story. Possibly the relief from shipboard constraint would have allowed a much bigger rocket booster to be fitted to the ABM version for a better head start, but ultimately it's still an air breather...