I need a flywheel cover for a 86, 4.3 tb, automatic, mine has been missing from when I purchased the vehichle, can only think of a plastic bag getting in there and buggering up the works. Anyone know if a V-8 with auto fits?

The cover fits the Trans, not the Motor, so any cover from the same type of Trans will work, regardless of Motor Size.

thanks, now whats the factory tranny, 200r4?

There were several options on Transmissions, Go here http://www.nastyz28.com/chevy-transmission-identification.php and you will be able to identify which one you have by the shape and number of pan bolts.