Jay.
Having read much data and viewed many Ace and Aceca's over the years I have never seen a Salisbury Diff in a Standard unmolested Thames | Ditton Ace or Aceca.
All have been fitted with ENV differentials with ratios of 3.6- 3.9 or 4.3. ( I have a tabulation of Diff Ratios against 16" and 15" wheel sizes which could be of interest if its for evaluting ratios for racing.)
However many Aces and Acecas lost their original engines and as values were low they were treated as a everyday cheap second hand sports car, Therefore were Cobra-ised by receiving V8s. V6 or straight 6 conversions, resulting in Higher torque and greater BHP.
This often resulted in Mutalation [V] of the rear end and converion to various rear ends.[
].[V]. Mind you it kept the AC on the road or track and out of the scrapyard.[
].
So we should be gratefull.[
]
Not sure if this helps, but I err on the Side that all Aces and Acecas left Thames Ditton fitted with ENV Diffs, However that doesn't mean AC Cars didn't experiment with the odd conversion as they were manufacturing Cobras alongside the last Aces.
Hopefully someone more knowledgeable can elaborate.
P.S.
In the meantime if you need a Quaife LSD for your ENV I have a NOS unit in secure dry storage which never found its way into the ENV diff of BEX333 as intended .[
]
Keith..[
]
