While it's all possible a blow through carby setup is difficult to make work well..... which is why you don't see them around.
I think that Weber made a 32/36 for a blow through application so that's a great starting point.
Remember that you'll need to get a distributor set up properly for this. I used a Series 2 Bluebird Bosch distributor with no mechanical advance and a custom vacuum advance/boost retard module. If you're in Melbourne I can recommend an ignition expert who can do this.
By the way, have you considered straight LPG? This has many advantages over petrol, like high octane rating, better mixture distribution, cheaper hardware and easier (cheaper) tuning. Remember it's easy to spend a fortune on dyno time getting a custom package running properly.
My 180B has an external gate T3 blowing through a custom intercooler and a Gas Research mixer with water injection. Again, if you're in Melbourne you're welcome to come and check it out. I may even be able to help you with some of the bits you'll need.
If you want to discuss it in more detail PM me your number and I'll give you a call.
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