I'm going to assume you will get custom cams made up. To do it propperly you really need custom pistons... And if your going to get pistons made, then use a 26 head (because fitting side draft carbs will fitt better) then use any rb ignition set up with a stock ecu (that you can fitt a nistune board to).
If you arn't getting cams made, and you don't want to get pistons made. Use an r43 neo NA head, deck the block and machine down r34 neo N/A pistons to get enough valve clearance (or machine valve reliefs in the piston crown)
Either way you need 10:1 + static CR to get the best out of it using good fuel.
I have spent some time in your area and I think you may find it hard to find somone who can get the best out of a carbied set up (especially due to the heat, even in winter)... carbies are verry sensitive to everything.
To get the sound and look, I would still bolt side draft carbies on and still run fuel injection/sequential ignition. I have seen some pretty cool injector-in-carbie builds (to retain the look and sound, but deliver a much better fuel controll (cold and hot start, idle, accurate afr at all load and rpm etc etc).
Cheers
Justin