Scaling Up 1080p Video in 720p Sequence?

All of my footage for a project is shot in 1080p. The final media will be delivered in 720p. I want to scale up some of the footage (jump cut) within the sequence. What is the best way to ensure that the scaled-up clips are at maximum image quality? Does it matter if the sequence is 720p or 1080p? Thanks for any help.

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