Depends how handy with the spanners you are! You can swap the entire sump pan and camshaft (which carries the PTO drive) from your existing engine onto a good 'donor' non-PTO engine of the same basic type. (This will at least ensure that the PTO shaft is the right length, as they varied depending upon the application).
Fitting a newer engine is pretty much impossible if you want to retain the power drive feature.
phil_saunders@bigfoot.com
Phil Saunders
September 2008