two bolts on the rear of the block are for the exhaust flange stabilizer
they are safe to remove if your stabilzer is missing
this is essentially a thick piece of metal bolted to the block and to the exhaust down pipe to hold the exhaust sturdily in place
there is also a single bolted (on each end) bracket connected to the transmission
as for the wires......i would estimate because they are green and black?
hmmm.....yes well that is a question
there are several sensors on the transmission side of the head