After Ideas,

You've got $1500, this must include labor, tuff task I know

Your goal is better performance/ better acceleration of the mark, not worried about top end speed so much.

You have a standard 1275 single carby.

The catch is, when you pop the bonnet everything must look totaly orriginal.
(twin su's r out.)

let me know ehat you would do

drink it

I wouldn't do anything, I'd rather have the 15 hunji in my pocket.

I would spend it on the head, and a better set of pipes, get the manifold ported and maybe a set of offset rocker bushes, oh and what ever variant of GR's cam that is popular at the time.

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To achieve your goal the easiest way is change the diff ratio.

what ratio is best?

You never siad that you wanted the best. You said that you wanted quicker acceleration and better performance and not worried about top speed.
Just going back one ratio from what you currently have will improve acceleration at the expense of top speed.

What ever you decide to get shop around and talk to as many people as posible about what you want to do. That way you will get mor bang for your buck.

If you want bang for a buck, get some cheap fireworks.
Anything good costs money.

If you want it to accelerate faster spend the money on a diet

I'd get someone to do me a head & cam to go with it (GR for both I guess)

but..... it's a can of worms, because if you raise your compression and make the engine work harder, the next weakest link will rear it's ugly head, and chances are your bottom end will be it - if the engine is tired, as soon as you put a high squish head on, you'll find the rings can't cope and you'll be blowing smoke everywhere, and hey presto you're rebuilding the motor and your $1500 has turned into a lot more

Vizard has some nice mods to the 1 1/2" carb to make it flow like an 1 3/4" - I did them to my twins and my bum dyno said it was going harder

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did I tell you that I won a trophy?

cam and headwork

Give Graham Russel A call, In My Opinion, He would Have to be the Best This Country Has, For Making Your Car Perform

IMO with what you said you want I'd recommend changing the diff. It will depend on what you have now as to what you should get to accelerate faster.
Any mini friendly place should be able to do this, it would be a lot cheaper if you take the engine out yourself and simply take the diff in. That way you might have some money left over to tart up your carby a bit .

(I think you need to remove the engine to get the diff out can someone correct me if I'm wrong).

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Respect mine and I'll respect yours.