$400 to $600 is the range for having someone else do this transplant,
and I highly recommend this route if you are a novice at engine R&R
work.  Expect to find other bits that will need replacing too, such as
the clutch, exhaust pipes, etc.  And the flywheel is probably different
too, so you may have to switch them.  Have  it machined and replace the
oil seal.

DIY requires a paved work surface, two floor jacks (one large one for
the engine and one small one for supporting and positioning the
transmission), a basic mechanic's tool set, an engine stand (or sturdy
table) to put the engine on while installing parts, lots of rags,
patience, a Haynes manual, luck, fortitude, perseverance, etc., etc.,!

This time add an oil gauge!  http://www.bus-boys.com/bbvdo.htm

Of course, that is no guarantee you won't blow another engine if you
ignore it like I did!
--
Stuart MacMillan
Seattle

'84 Vanagon Westfalia w/2.1
'65 MGB (Daily driver since 1969)
'74 MGB GT (Restoring sloooowly)

Assisting on Restoration (and spending OPM):
'72 MGB GT (Daughter's)
'64 MGB (Son's)

Stripped and gone but their parts live on:
'68 MGB, '73 MGB, '67 MGB GT