65 barracuda 360 la

If it was a slant 6 car to begin with, I would seriously consider upgrading the torsion bars on a street car. If it was a 273, you should be able to get away with it for a while, but remember- those are still almost 60 years old... So it depends on your ultimate goal with the car.
Also consider a brake upgrade if you just have 9" drums.
LOTS of other considerations, especially if it was a slant 6 car. TONS of posts on this, so I don't need to get into it here. "Search" is your friend. Look in the "Early A" forum.