Acseatsri wrote:
Those are REALLY thirsty beasts, so I would guess at least 30 gallons, having run similar but slightly newer 150 hp beasts on a 23 WA and achieving about 1.5 mpg. I believe those may be cross flows and not loopers and will get slightly worse mileage than my old 150 loopers with the 3 2-barrel carbs.

The newer single Honda 250 gets right around 3 mpg lightly loaded, so when you repower, I would expect mileage to double with modern fuel injected engines.