Re: hood clearance
The more, the better. But I have less than 1.5" with no apparent issues and that's with the air cleaner assembly removed! FWIW, I recently browsed through a book by Smokey Yunick and 3/4" was mentioned as being the absolute minimum. Don't know if some carb's are more sensitive than others. I have a Holley. Underhood airflow/turbulence may have an affect with a aircleaner baseplate being helpful.
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