That frame is salvageable (the point where it broke, I learned, is a common failure point in crashes), but it may be cheaper/easier to put a new one underneath - especially with that additional wrinkle in the arch.
When I was doing research for an accident repair, I learned that '64 to '67 frames will interchange. Chevy frames are shorter, but I believe that the Buick and Olds will work. I found a few Pontiac candidate frames, so they don't seem to be rare.
To do so - you'll need a good frame guy (who are fewer and farther between every day).
Are you doing all the work yourself, or paying someone to restore it?
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 1965 Pontiac LeMans. M21, 3.73 in a 12 bolt, Kauffman 461.
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