If you are worried about being upside down
Then move on.
take it from someone who has 2 71 rr
These cars are not easy to restore
They have A bunch of Hard to find parts
The cost of parts are
Just as expensive or more then a e body.

be prepared to flush 500 at a time
And to repeat this many times!
you better really love the car or
You will soon be hatin on it fast.