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Why? No reason not to rebuild it and dive it. ...The guts of the first stage are the same as most USD diaphragm regs and the seconds have common parts....The Conshelf kit from Vintage Double hose will work fine.
The 300 and 350 are earlier versions of the 360.
One of the problems with Dacor was that they didn't have a common (to the line-up) HP seat whose dimensions remained unchanged over years (unlike USD/AquaLung).
I haven't got any Dacor regs left to try the AquaLung seat and see if it's a fit.