where could i find a decent used engine?

[inpassing]

as above.
or is it just your luck when you buy 1?

 

[Fletcher]

Find one that made good power on a rolling road when it was fitted?

 

[inpassing]

do you think im better getting my 1 oppend up and repaired (£1000) or am i better taking a chance with a second hand 1 and having them swaped (£500 all in)?