Stuff the cylinders with clean, oiled rags to catch all the crud.
Get a piece of steel, minimum 1/4 inch or thicker 8" x 12" the longer the better.
Your local steel supplier will have a lot of scrap pieces that will cost you a dollar a pound about 10 bucks a square foot.
New steel is plenty flat.
3/8th or 1/2 inch are even better, the weight will do the work for you.
NORTON 220 grit
One can of 3M spray glue
Glue paper to steel plate, sand in a circular motion.
Be careful and watch what you are doing.
I have used this method on several
engines, I have not had any issues.
When it is flat and you have a good swirl pattern clean the surface with a white tee shirt
and acetone or lacquer thinner.
Wipe until there is no more color being transferred to the rag from the block, probably three or four wipedowns.
Wipe the head the same way.
Get a FELPRO gasket - yes perm a torque. Use other brands at your own risk, if you do not want to do this again use the Felpro.
DO NOT touch the sealing surface of the gasket the oil from your hands will make it not stick. wear nitrile gloves and only touch the edges of the gasket.
Leave it in the package until you are ready to place it on the block.
Be sure the bolt holes have been chased, take an old head bolt and file a slot on two sides and use it like a tap.
Be sure to blow out the junk when you are finished. lubricate the threads, a drop of oil on the threads, put a little on the white teeshirt rag and wipe the bolt threads with a tiny bit just enough that they are not dry threads. NOT DRIPPING with oil, you do not want it going all over the head and block.
Wipe some oil under the bolt heads and washers, both sides.
Torque to speck. A half-hour later double check your bolts, it won't hurt.
The first start run it up to operating temperature then shut it off and let it cool off, we want to give the gasket and head, block a chance to get to know each other. The heat will help them bond, then they will be together for many years of bliss.
Re-torque after the first run won't hurt it.
Leaving it alone until the next day won't hurt it either.
Next day do it again and check that everything is staying tight.
Then drive it like normal and hope it was all put together right.
While driving down the road you can be thinking about did I do this, that and the other.
I hope there are no surprises.
Don't go cheap on the abrasive, Norton is the best, it stays sharp, cheap paper just rubs the abrasive off the paper.
You can do this, just keep it CLEAN!!!