My fav car was a 1968 GT cortina.
30 tho oversize pistons, balanced bottom end, a lot of work to the top end and, a 48 mm Webber, extractors and a 2 inch system, cam, a heavy duty clutch. and a lot more and I remember i used to spew about the cost of the spark plugs i used, but they made so much difference .... but can't remember what they were called. It was a real beast and very quick. I used to love dragging off unsuspecting EH's and such. I remember that the E49 chargers used to cause me a lot of grief and I could hardly ever beat them.
cheers
Pete