Hi guys i have a question about the manifold for oval port head,can u run the standard carby or do u have to run twins.

Whatever you like.
Oval port heads were still standard with single carbs in a lot of cases.
To get full value out of them a 32/36 weber or set of twins will work well.

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Where can u get webers from and are the expensive.

32/36 are of xf falcons and the like. cheap at wreckers and usually in ok condition still.

idealy you need to rejet them to suit but i can one on an a15, ran a little rich but went well compared to twin su's even.

the adaptor available through lynx i think still.

you can buy all types of webers from ebay, and yes theyre quite expensive but worth it i reckon, sound mad, more power, and i believe you get the "feeling" in a weber though the throttle etc., more than you will ever get with anything else... My opinion.
A twin sidedraft manifold new might be $250, and a pair of webers might be found from 600 to 1500... 600 needing to be rebuilt of coarse.
Dont forget if you are to get a weber or two, if its not new then generally it will need to have acarby kit put through it/freshen up. Or if its off of another car or larger/smaller engine, all of the jetting/ choking and other bits need to be done!!
Plus a dyno tune aswell which might put you out aorund the 500 mark, (from memory from what people told me, my local mechanic i have my maching work done doesnt get change from 600 when he gets his single downdraught tuned on his rotary....)
But the weber sound and 'funness' is like nothing else, i love mine!

Better are Dellorto DHLA or even Solex 40s.

I am going to be running twin Dellorto DHLA.... wish I had a oval port head though.... not easy to get....

Not easy to get? What happened to the one that came with your A15?

oval port heads are easy enough to get, but finding an oval port head for a 'bargain' is a completely different story! Put a post up that you're looking for an oval port head, i would be surprised if you had no attention...
Also contact Bige member (Ernie) he build A series race motors, he should be able to help you out...