HI Gary
I don't understand what part did not fit.....
You mentioned the .... mounting casting were wrong....?????
That looks like a perfectly good 235 and should bolt right up to the CMP bell housing.
Side motor mount can be discarded and the front support drilled to accept the CMP / GM front engine mount.
The whole large donut at the back must be removed.... and the adaptor plate to fit the Pwoerglide needs to be removed to the bare block.
Usually all that is needed is to redrill the crank and install a pilot bearing for the tranny shaft.
Do you have a picture of the bare crankshaft end.....? so we can see the difference......
We have a spare 261 engine at the barn which came with a Powerglide tranny so we can make an easy comparaison.......
Don't sell it yet........
What is the engine number by the distributor and what is the cast number on the head near the carburator side.......
If you are interested in looking at Canadian engine serial numbers have a look at Stove Bolt site.....on the forum go to the Engine shop .... at the beginning is a thread on engine Casting ID....... AND THAT WORK WAS THE INFORMATION/DATA..... DONE BY NO ONE ELSE BUT...............
OUR DEAR FRIEND ........ David Hayward......
try the following link.....
http://www.stovebolt.com/ubbthreads/...127#Post512127
Half way down the lsiting you will find some PR 387XXXXXX engine numbers circa 1942/43
If David was here he would, as usual, help us navigate this treasured information. Make ourselves a copy for your files.
Bob C.