Distributor for MGA

[Kevin Mardell <kmardell@julian.uwo.ca>]

I'm doing some repairs over the winter on a recently aquired 58 MGA
roadster. The alloy distributor base is broken away where the ring clamp
tightens it in position, presumably from years of overtightening. 

I have several other old distributors in parts and would like to swap
bodies. Is there any significant diference between the 25D (MGB?) and DM2
(MGA?) distributors.  Can I use either on the 1500 engine? Any help would
be appreciated.

Kevin Mardell