I'd cruise it, use it up so you don't put wear and tear on your other cars, I drive a POS taurus wagon for one of my daily drivers.. My 73 blazer doesnt need the extra miles and neither does old yeller, my 72 pickup. I feel like total blanco basura driving it but who cares.
I had a 78 monte, (your car looks like a monte,dude, thats why people call it a monte),
I got it for free, beat it till it was on its last legs then sold it for 100.00 to someone worse off than me.
I wouldn't put anything in it, drive it till it blows then it goes.
Here some more-
Give it to the local high school as a auto shop guinea pig
glue 7000 kewpie dolls on it and get press and attention as the local "art car"
If you want to feel good give it to someone who has no car. Unwed teenage mothers on drugs are always lookin for cars.(I done that one a few times)
put an ad and sell it.(said before)
spray paint it phloresent orange and put bullhorns on the hood. act like an eccentric millionaire rockstar when you drive it.
Thats it i'm done.