g60 MK1 Gearbox/clutch issue

So all of a sudden it is very hard to take in and out of gear and the clutch doesn't seem to be engaging fully (car creeping forward when in gear). The location of the gears seems to have moved to the left as well. Its got a gearbox out of a corrodo and hydraulic clutch. Anyone know what the issue is is it something to do with the synchros?

Creeping in place would indicate that you have a clutch issue.
Have you bleed the slave cylinder on it.

Gear that are shifted is sounding like a motor mount issue, as gears going out of position in a 4 or 5 spd is usually the rear front or drivers side mount.

Thanks for the reply
Im gunna give it a bleed tomorrow, it was going through my head that my be the cause
Ok, it had some work done which involved taking most of the engine recently. What I am thinking is it hasn't been put back in right?