what to worry about when..., ... using an mr2/calida 3s over an celica one. Options

[urbandork]

Every one says that one use a clip over an engine and that an GT4 clip is best.

BUT

what are the exact reasons why. I read a lot of post and everyone jsut says its a pain.

Things ive thought/read about are.

axles
wiring harness (not sure)

is there anything else. because its seems to me that getting a 3rd gen 3s from an mr2 would be the way to go. for these reasons

it already has an lsd tranny that an front wheel drive car can use. (not sure)

All that is needed are axles

if i have the mr2 wiring harness cant the pros here just adapt my stock 5s harnes with the plug ends of the mr2's 3s???? not sure how this works

this last bit is a little one but the fact the the mr2 3s doesnt have the a/w IC would mean less stuff to plug off as id be using my FMIC set up off my 5sfte.

thanks for all ur input