First - Installing The Oil Dipstick Tube:

cleaned up the dipstick tube with brake cleaner, and scraped off the old sealant.then applied a liberal dab of thread sealant just below the ridge near the lower end of the dipstick tube.

inserted the dipstick tube into the hole in the engine block and placed a 3/8 inch open-end wrench over the ridge. Then  hammered on the wrench with a small hammer to drive the tube into the engine. I was not able to push the tube in more than 1/4 inch... I hope the sealant blocks oil from escaping.

This will cause a problem: 

The dipstick will not give an accurate reading. Since the dipstick tube is too high, the oil on the dipstick will show a reading that is lower than the true level of oil.

Installing The Exhaust Manifolds:

Cleaning Up The Mating Surfaces:

used a coarse Roloc Bristle Disc to clean up the exhaust manifold mating surface on the cylinder heads. After this used a fine regular Roloc disc to clean up the scratches left by the aggressive bristle disc.

cleaned up the mating surfaces of the exhaust manifolds using a coarse Roloc Bristle Disc, a smooth file, and regular Roloc abrasive discs.

meanwhile later, cleaned up the manifold where the exhaust pipe connects (the funnel-shaped area between the three studs).

Note the orientation of the exhaust gasket, sometimes called a "donut". The metal prongs go inside the manifold.

Cleaning Up Bolt Threads:

On the cylinder heads,chased the exhaust manifold bolt holes with a 3/8" - 16 tap.

To clean the bolts, buffed them on a wire wheel and then ran them through a 3/8" - 16 die, which removed the old sealant from the threads.

laid the exhaust manifold on a block of 2x4 to keep the mating surface off the table, then inserted the bolts through the holes into the gasket.The gasket is made from multiple layers of metal and there are tabs that hold the bolts.

While doing this,  set these heat shields in place, because they are held in by the manifold bolts.

Held the exhaust manifold against the cylinder head and threaded the bolts into the engine.

Then  tightened the bolts to 11 foot-pounds, working from the middle outwards. After that, tightened the bolts to 22 foot-pounds in the same pattern

The left-hand exhaust manifold after installation.installed the accessory brackets on each head, just above the exhaust manifolds. These brackets hold the spark plug wires in place.

The right-hand exhaust manifold after installation.Note the black-painted metal bracket (red arrow) on the left-most manifold bolt. This bolt is different from the others, it is a bolt-stud combo fastener. This fastener must go in the right place or else it could be a lot of work to move it later.