Hey that is a screaming deal on the Probe, I buy salvage all the time ( I'm in the biz) and up here you can't touch one of those thats any good for 3 times that.
I've had several of those engines out and FWIW they are not the same longblock as the the Zuk from looking at them.
It's a straight Mazda engine, big brother to the one from the MX-3 Precidia, as a matter of fact thats an easy swap the 2.5V6 for the 1.8V6 in the Mazda's.
From the auto biz perspective it is a popular motor and does have a rep for popping the bottom end, but considering all the young buck ricer types driving them I guess that should not be a surprize.
They are not light I haven't weighed one but from throwing them around the shop I would guess they are in the 4-500lb range. Tough install with all the electronics
There used to be a place called Kennedy Engine Products in Wash/Oregon that made adapters for darn near anything into darn near anything they might be a good source for an adapter, their stuff was good. Sorry I don't have more info.
Zag