entering stage right.............................a smaller engine would be better, considerations are: storage time/conditions, previous history, condition etc its a bit dodgy buying it without seeing it, if the fuel control unit ( fcu /hma) is knacked then ur talking major $$$$$$$$, a boroscope would give u a good idea of condition.
Would also be preferable to get one that does not have VIGV's (variable inlet guide vanes) or FADEC if u look at the rear engine u can see a fairly long straight bar, towards the front, this connects to the guide vanes for the compressor rotors, which makes things a lot more complicated.
ignition is not a problem - it only needs a few sparks at the initial spool up, after that u can turn the ignition off as it is self sustaining.
fuel and air control and instrumentation is a whole different ballgame tho something i would not look forward to