Vega
I owned a Vega and loved it. It was a small block car.
I think you would be pushing the front suspension if it hasn't already been modified to handle the extra front end weight of the BBC.
You might be better off in the long run finding a car in your price range that already has had a BBC, including front engine plate, mid plate, cross member and headers.
Oil pan clearance is an issue if it has the stock cross member. I had to rework the SBC pan to get the engine down far enough.