Slant heat riser block off/delete?

For performance, I agree the heat to the intake is not desirable. But in most (and I stress "MOST") cases, intake heat improves drivability and economy.
Not exactly the same situation, but when I built my draw thru turbo slant, I had to add heat to the bottom of the carb adapter. Initially, without heat the bottom of the adapter would frost up at idle, and fuel would "puddle". Engine idled like a supercharged gasser (had that rolling idle). I added hot water from the heater connection to the bottom of the adapter, and that cured the idle problem. Above idle there was enough air/fuel velocity to keep the fuel from dropping out of suspension.