Reply to "I'm digging the look of this car, thinking about doing this to my all-white car"

Those I believe are Weber 48IDA's with 6-1/2" tall velocity stacks. Those put the stacks about 1" under the roof.

This helps with keeping water out of them but you need to extend the roof out over the last two. That is usually done with 1/4" "Plexiglass".

The 5" is actually a better fit.

The tall stacks help with keeping the "fuel reversion" in the carbs with a "regular/non-Weber specific" camshaft.

You clearly can see the "fuel cloud" over the stacks on the standard trumpets. Definitely not on the 6-1/2", maybe you can see that floating inside the top of the 5" at speed?

You don't run a "Weber camshaft" if you are going to run in competative events. Those are for the Gucci loafer crowd that doesn't want to get messy.