James, if you are talking about installing a TiiCo engine
(www.tiico.com) then this price is not that bad. A breakdown:
4000$ for engine
200$ for shipping
$100 mis. stuff (injector seals, fuel lines, etc)

The book-time for a tiico conversion is 22hours... so if you run the
numbers this corresponds to just under $55/hr. That is not THAT bad a
rate.  For what it is worth, i wouldn't install a TiiCo in someone
elses' bus for under 1000$.
-Matthew
86 syncro westy tiico