I haven't checked my mileage since swapping from the Edelbrock to the Holley and swapping from points to an electronic, inductive ignition system.
I just made a 98.1 mile round trip on the highway. I got 16.87mpg doing between 70 and 80 mph, with overdrive. The last time I checked, with the Edelbrock and points, I got about 14.5.
The Y has plenty of passing power, even in fifth. Oh, the future will be exciting
It sounds happiest above 2000rpm. 70 is about 1800. I'm going to look for a 4.11 to swap and I think it will be where it needs to be.
Lawrenceville, GA