You are imagining that a rebuild on a SHO engine is the same as a Small Block Chev. With the chev, you automatically rebore the block, buy new pistons and rings and gaskets, index the crank, and cut it .010 or .020 and get sized bearings. You get new lifters and a cam, buy a new oil pump. And on and on.
In the case of the SHO, there may be exceptions, but usually you will not need to rebore the block, buy new pistons or even rings. Unless the crank is scored, you will not need to grind it and get oversized bearings (although new rod bearings are often, but not always, needed).
You will be using your existing oil pump as there are no new ones, and the low pressure design means they seldom wear or fail.
You may not have to touch the bottom end at all, unless you feel you have a stuck ring, but removing the rings, cleaning the carbon from behind them, and re-installing the same rings is the gold standard if you are so inclined. Often it is not even necessary to hone the block as the original hash marks are still visible, partially due to the low tension design of the rings.
You will not need a new cam and you may not even have to shim the bucket type lifters.
The people who do all the same stuff to a SHO engine that is done to the SBChev are people who want more displacement, and are race inspired to turbocharge or supercharge.
These engines were built from high quality parts and assembled in the equivalent of a clean room by people in white lab coats; as apposed to the opposite case.
Find out what is really wrong with your engine and fix what is wrong. Head gaskets and upper valve cover gaskets are expensive, but if that is all you really need, it is not so expensive.
