I have been running the same Edelbrock 1407 for over 20 years. From a 413 to 360 to 318 to a 225.

Worked fine for me, had to tune it a bit for each engine combo. On the 318 I got low 20's for mileage, a 1406 would get me mid 20's, both highway. The 360 was a bit lower, the 413 lower still, the 225 was a lark, never checked mileage, I had a 4bbl intake so I had to run it at least once just to see.

That said, and I have made this offer before with ZERO takers, I will buy your POS Edelbrock carb's at $25 a pop.

I expect to, once again, have zero takers.