Welcome to the club! :wavey:
It's the 3.4L that's a super easy drop-in. the 4.3 will require a whole new drivetrain and a bunch of custom stuff since it shares nothng with the 2.8. The 3.4L is identical to the 2.8L on the outside, but vastly improved on the inside. They can be found in early 90s Camaros and Firebirds (or as a crate motor from GM). You can either swap over the electronic fuel injection fromthe car, or swap in an aftermarket intake and carb onto the new block. all the exhaust will be the same.
For photo loading tips see this post:
viewtopic.php?f=6&t=11077