That is impressive for the stuff that has been done.
Nicholas. If I were you I would go to weber sidedrafts.
I do not have much experience, but do know they make a huge difference on power and of course fuel economy.

What the heck for fuel economy.
15 to 16 sec is impressive for a 1400cc.

Here I know of 2 guys that got the following:
1800cc volkswagen golf mk1
he put a audi 20valve head that is worked on it.
288 cam
and 2 sidedraft webers.
He gets about 14,4 sec on 1/4.

And a 92 volkswagen jetta.
with a 2 litre that has a worked head.
standard fuel injection
288 cam
he gets 16sec on 1/4 with racing fuel.