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Go to the library and look at the Service Manuals! That's what I did. Here's what I remember: (if I leave anything out, don't kill me, this is what I remember)

Off the top of my head, you first remove the air cleaner, throttle linkage and all the wires connected to the throttle body. Then remove the plug wires, distributor cap and distributor. (make sure you mark the position of the rotor, so you can put it back together in time). The didn't say to do so, but I wound up removing the air conditioning compressor, alternator, belt adjuster and brackets for the above before I could remove the heads.

Next remove the intake manifold and rocker covers. Be sure you get all the bolts out before pulling the intake manifold, some are hard to find (on mine at least) and you could damage the manifold.

Now remove the exhaust manifold bolts and exhaust manifolds. (What worked for me was to use a pry bar to carefully push the manifolds down past the lower head bolts AFTER roving the spark plugs - but that's not what the book said to do and could damage the exhaust system if not careful). Next remove the pushrods and rockers. You should keep the pushrods in order so you can put them back in the same place they came out of. I did this by punching 12 holes in a piece of cardboard and pushing the pushrods through the holes, one by one and labelling the cardboard Front and Rear, so they would be in proper order.

You can remove the head bolts in any order, but be SURE you torque them to the CORRECT TORQUE SPEC in the CORRECT ORDER when you re-assemble.

When you get the heads off, be sure to remove the old gaskets completely or the new ones will fail. The best thing is to take the heads to a machine shop and have them checked for cracks and/ warpage. ( I did not do this, I cleaned and checked them carefully myself - and I'm taking my chances. THIS DOES NOT MEAN I RECOMMEND THAT YOU DO THE SAME THING I DID. )

That's as far as I've gotten so far, so I hope I've been of some help.

btw, my Astro is a 1989 4.3L v6 w/ air and automatic trans.

Good Luck

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Q: How do you replace a head gasket 89 Chevy astro?
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