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Your IAS of about 140 knots or 165 mph is in line with what my 73G model indicates. My true airspeed is usually about 180-185 mph or 155-160 knots. It does not sound as if your indicated airspeed is obviously wrong but I cannot speak for the angle you mention as the 1973 models have a completely different pitot tube arrangement altogether than the earlier models.
Ed
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