Mechanically:
If you want to fit a manual engine + gearbox you will either need a manual Rover subframe , or else modify the one you have to take the manual gearbox mounts (your auto subby is wider than a manual one).
If you are referring to converting the existing auto motor (different oilways) to work on a manual gearbox, see my sticky thread at top of this forum.
[edit] Topic has disappeared, I will find out where it went...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
