If you are refering to using these on a 4 cylinder ford, it might be a wash in terms of parasitic power loss, unless the motor has high specific power as a N/A motor. When I was a Comptech USA employee (Acura/ Honda Tuner shop) the ultimate power increase for the Honda S2000 roadster with a paxton kit we designed, led to a 401 hp 2.0L motor. from what was a 240 Hp stock. This was a track car and not smoggable. The Pinto might get over 250 with paxton , but a turbo would be a higher specific power rate.
It's just my 2 cents worth..
Pintosopher
BTW In 2003 dollars ,that kit for the S2000 was $4995, Headers not included ( 650 bucks)