Not really sure but a double webber carbie setup, is thet just two webbers on a different adaptor. I hav two webber 45's and was wondering whether it was done like that. No it is not for my magna :D

Yep.

V8 - one carb per bank.

4cyl - two carbs + 4 cylinders = big power + no fuel!

Yes a new intake manifold is usually required if upgrading. If it's already a twin setup (as in my old V8 Landy) then it's often a straight swap sometimes with an adaptor.

u can get the twin carb manifold from the sigmas and adapt that to fit the magna then use the carbs u have i spose.

Well i have set of twin 40mm Dellortos on my corolla. ( Dellortos and webers are similiar carbs)

Depending on what manifold and carbies you have, depends on the setup.

My dellortos are a side draught setup and i am using a redline manifold which in fact with the carbies act as a carby per cylinder. if you want more info i can email you some websites that can help you with what you are asking,

PM me with what you are enquiring about doing work to.

Cheers
John