With a Ford ADO, final gear is .67 or .71 ( 2.88 or 3.05 final ratio with 4.30). His 2300 RPM at 70 should be 2600 to 2760 with the tire he says he is running.
If he is calculating by his speedometer, he is actually understating his performance. This may be an 8 second car!!!!! What a buy!!!
Dave