A mate had a gs7/10 for years, told me it was a strate swop, just needed to tweek the mounts/ swop/interchange/mixup the 750 and 1000 mounts, he was even using the 750 airbox as it was a all year round bike.
Not done it myself so only repeating what I was told, as I was thinking of doing myself when I had a spare 1000 motor.