Everyone's car is a little different. But, if it helps I measured clearance on my 68 with a stock engine. With a ball of aluminum on top of the cleaner I shut the hood. I did this 2 times, one on the front edge of the top and one in back. The foil crushed to just under 2" at the thinest. With a drop base cleaner you could have a total of about 4" to play with I'd think. Depends on the drop base assembly too!
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