With a car like this, value is a complicated issue. The most important thing is overall condition and to be sure all repairs and restoration was done properly.
Details matter in this price range. A really good, flawless paint job adds a couple of thousand to the value. A cheapo paint job with poor materials and full of orange peel detract from the value.
All other things equal, a modified car is worth less than a well -optioned original. The original engine and transmission add value, replacements don't.
Imho $23,000 is a premium price for this car. But is its in excellent shape with well-done mods, its worthwhile, especially if it provides years of trouble-free enjoyment for you.
However, if it's less than perfect, in any way, don't bother.