I am stunned, he took a perfectly good auto and converted to manual, the guy is an idiot. There are so few auto Manta's left, I really don't know what to say. Yes it is good he restored it but as for the conversion 
Actually it's a pretty dam' good conversion.
Although I've owned a B series for 36 years I've had , 7 I think , A series too . I built one over a three year period in the early 90's which is still winning shows here in Ireland on which I did that very conversion.
The A series auto came with a 3.44 /1 diff rather than the more common 3.67/1 item. The ratios of the Getrag 240 box suit that diff which gives the same overall gearing as the later B series GTE .
The conversion is simplified due to the fact that the A series auto prop is exactly the length required to fit the longer 240 box and as the original auto gearbox x member can easily be adapted thus the conversion is very easily returned to auto if required.The only other changes required are a manual pedal cradle which bolts in , the clutch cable exit shroud on the bulkhead and the removal of the inhibit switch.
No photos of the interior so I cant see how he finished off the console. The getrag gearlever is further back that the auto but I shortened the linkage by 55 mm which brought the gearstick back to the original position allowing the 4 speed manual console to be used which makes the conversion look stock.
The auto 4 speed gave a direct drive top with ratios and that 3.44 diff making the car rather lethargic .
Having driven and owned a series auto / 4 speed and 5 speed the latter is by far the better and most suited to modern driving giving a leasurely 70 mph @ 2750 rpm.
Done correctly it enhances the cars driveability and appeal.