Later model 3.8 swap in an "A" body

I am getting 20mpg hwy beating the crap out of a '71 318 with 110xxxmi, '71 2bbl cam, 302 heads, a holly 4150 650DP, edelbrock performer, hooker long tube headers, upgraded to stock orange box, OD4spd, 3.55SG 8 3/4, '71 swinger.

It's not the fastest car but it gets out of it's own way nicely.

I am going to do a mileage build 318 and shoot for 25-30mpg :)
Think higher comp + same small cam and spread bore carb; and 8 1/4 instead of 8 3/4.

Never been a big fan of the edelbrock carbs, lots swear by them I personally have never been able to get a proper tune, that being said I have one to try on my mileage build and I have a spread bore 650DP Holley to try too.