I incorrectly calculated the power to weight by using the gross vehicle weight. The curb weight of the fiesta is quite a bit less than that. I found this spec online for a 1981 UK spec XR2 at an online site http://www.carinf.com/en/55b046200.html .
So while these numbers are not wrong, the don't reflect the curb weight ratio.
Power to Weight Ratio
GVW
Stock - 63 HP/2690 lbs GVW= 1 HP per 42.7 LBS of Car
Rebuilt - 105 HP/2690 lb GVW = 1 HP per 25.6 LB of car
Curb Weight Ratios
Stock 63 HP/1766 CW = 1 HP / 28.0 lbs
Rebuilt 105 HP/1766 CW = 1 HP / 16.8 lbs
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