will a 2.5 NAD fit straight in

Hello,
I have a 1957 109 currently fitted with a series 3 2.25 petrol mated to a fully synchro series 3 box with an early 2 bellhousing to retain the mechanical clutch operation.

Might have access to a cheap 2.5 NAD - question is will this just swap straight in? Does in have same mounts etc? Will I need to move my battery tray?

Thanks

Drivers side mount needs moving and battery tray moves forward 2" or so clear the timing cover