Fitting a 74 engine in a 66 Midget

[stauffer@swarthmore.edu (Glenn Stauffer)]

I'm in the process of restoring a 1974 MG Midget and have the opportunity
to purchase a rust-free 66 Midget that isn't running right now.  Seeing as
my 74 has enough rust (sills, etc.) and some body damage and the 66 is
cheap enough that buying it and making one running car out of the two makes
sense, can anyone tell me whether my 74 engine and transmission might fit
the 66?  Also,  what else could I anticipate being interchangeable?

Thanks,

Glenn Stauffer
Kennett Square, PA