Fuel bowl size? Making it bigger, IDA and DCO

[sen2two]

I have a 51 IDA Weber and I need to enlargen the fuel bowl area. I will be running E85 through it right now and down the road i will be running pure methanol (alcohol) through it. I am unsure how much I will need to add to the fuel bowl and what will the effects be of over enlargening it? Does this effect on how I set the float height? or anything else?

One other thing. I thought about swapping to the larger factory 55 dco (side draft) weber, but I am unsure of how to make that bowl larger. I don't really see how it could be done on a side draft Weber. Maybe adding a separate reservoir off the side of the block above the Webers and letting it gravity feed into the bowl with large fuel line?

Ant help here would be great!