I forgot to answer your overdrive question. My car also came without
overdrive. I looked for several years before I stumbled onto a parts car
with overdrive. I chose to keep the 3.27 ratio diff (rather after the 3.27
diff blew apart, and I installed the 3.89 ratio to keep driving, I promptly
sourced another 3.27).
The only advantage to the overdrive with the 3.89 ratio is quicker
acceleration. For a given road speed the engine rotates at the same rpm
with a non O/D trans and 3.27 ratio as it does with O/D trans and 3.89
ratio. I did a lot of highway driving and wanted to lower the engine
speed.
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