So I found some one that has bike carbies so what is the best to get ?

I will more than likely use the Carbys off a GXSR 600 SRAD. From the research I have done they are 36mm Mikuni's. Ebay prices are around $250-$350 delivered to Australia. other option is GSXR 750 again from the info I have found they are 46mm Mikunis. I will go the smaller carbs as i think the 46's may be too big and limit the amount of turbulence into the engine. That's from what my brain is telling me not actual data. If anyone can comment or correct me that would be good. If not I will let you know how I go when I do it win or loose :).

I have CBR1000rr ITBs on a stock A15, they are 44mm throttle bodies and they are way too big. 30% throttle at redline is ~90kPa manifold pressure. I built a progressive throttle setup to make it driveable but I would go much smaller throttle bodies if I was to do it again.

A not bad rule of thumb is the individual throttles will be roughly the same size, slightly bigger than the stock single throttle/ combined area of the two throttle plates unless you're significantly increasing the rpm.

36/38 will be fine for a series and most mild l series.

On a mild a 34 could ve ok too

very general rule of thumb, look for carbs off a bike whose engine has similar power output to what you are chasing (or slightly less). So if it's a stock a15 (for example) maybe look for a bike with 60bhp or so. For a very serious a15, you'd want carbs from a bike engine making 150bhp or more depending on just how closet to full race the combination is.

Bought these of someone Now I need someone in Brisbane to help me make the manifold and set them up Please

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Now I have the Flanges as well

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Since you have flanges what I'm about to say may be useless, if you still have the vanette manifold I sold you years ago you could chop it up as the basis of the bike Carb manifold

MMMM I don't rember that but I Only have one Manifold now

Wait, that was dave 1200 f om Sydney . All you Dave's with 1200's get me confused