Trouble installing BB in truck

[Maxian]

I'm having trouble installing my BB in my '69 truck
Using factory BB tower stands and using the correct engine side mounts.
Just doesn't seem to fit. Like the engine is a 1/4 inch too wide.
I can get one side to bolt up, but not the other. I can get close, just can't get both to line up.
I've loosened the stands to see if there was any play, but will only adjust front - rear.
Almost as if I shaved 1/8 off one mount it would settle in correctly.
Any thoughts or ideas regarding this ? Common issue ?

Thank you