I have a couple of sets of turbo rods I can use, also a bunch of turbo pistons etc. I could just slap my spool I beam rods in it and a set of turbo pistons, that will keep it safe to make all the power that turbo can throw at it. So far the trans is fine, I've given it a pretty decent tune up and it's behaving itself for now. Obviously that will change if I throw much more power at it but again, I have some bits I can chuck in it to make it stronger without costing anything. It would be better to have a spare engine so I can do the work on one, then swap it over in a day so there isn't much down time.
@Typhoon you're selling an engine ain't ya?