Powerglides will not bolt up directly, you will need an adapter plate.SOme are happy with the conversion and others are not.
You may be able to find a Hydamatic from a Chevy or GMC truck that will bolt up to your 235.I have heard that the engine and trannys are a matched set due to machining. I do not have the full info on that aspect of the Hydramatics but it may be that it has something to do with the engine to tranny adapter ring that is matched to the tranny.
I do happen to know where there are two Hydramatics with the adapter rings. cool

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