My Heavyweight Twins Manual states:
To remove engine and gearbox as a unit:
Remove fuel tank, exhaust pipes, carburetors with air cleaner.
Remove tacho drive, clutch cable - gear box end, then the engine plate cover over gearbox.
Remove breather pipes and oil lines.
Remove rear chain connecting link.
Remove right side foot peg with its rod, from the left side.
Remove all the bolts passing through the front engine plates - loosen the nuts only on the bottom one only.
Remove spring for central stand - with the stand in the up position.
Remove the nuts on the left side of the rear engine plates - then take out the bolts.
Lever the engine upwards - the loose nuts on the lower bolt can be taken off, as well as the engine plates.
Move the engine forward - lift up - and out of the frame.
Hope this helps,
Slick