Chris,
Alpines engines, if original to the car will have a matching ID number to the 
chassis number.  You can look at our web site (http:www.classicsunbeam.com) 
to see which Alpine the engines come from. Various other Sunbeam parts 
supplies have the chassis numbers listed in their catalogs as well.
In regard to the transmissions: the have a built date on the drain side of 
the casing which will tell you what year it was made.  Heads are also marked 
with a built date. Take off the valve cover and look toward the center top of 
the head.  remember that the British use a backwards dating system, the head 
may read 66 k 3 which would give it a built date of 11/3/66.  Heads also have 
a casting number AM-1, AM-2, AM-3 an AM-3 would be a head from a 1725 engine. 
 Of course you could also check valve size.
Best regards,
Curt
Classic Sunbeam
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