Thursday Twister: A Swap Too Far?

Is there anything sacred left in this world?  First, the Spice Girls fragment into a few less-than-stellar individual acts, and now somebody swapped a Mopar 340 V8 into a convertible ’73 Mustang (tip from Rock On!)?  For today’s Thursday Twister, I’d like to ask you when has a swap gone too far.

I guess this fits into the category of “why” for engine swaps.  I’d understand if you shoved a late model twin-turbo V8 from a Mercedes-Benz under the hood, but here it seems like the builder just had an extra Mopar engine sitting around in the garage and wanted to kill some of the resale value for his/her Mustang.

Where does the line of good taste for engine swaps sit in your garage?