i havnt yet seen mention of the old 7Kc 1.8ltr motor, if you could pick one of them up (a bit rare tho) and conbine them with some cheep twin carbies you would have a bit more power for a lot less then some of the other options... if you had an ae71 4age would be the go for sure but ke70 you will have all thoes extra parts to convert as well.