71 4dr Dart 318 w 4bbl

Dartemus said

It is my primary mode of transport. 20 mi to work and back.

With occasional passenger "check this out" and occasional deserted road "leg stretching"

It will be an in town car. I'd like the ability to pass at will on freeway to make an exit... And drive 20 mi of surface streets without dying.

Click to expand...

when you talk about passing on the freeway and stretching your legs on the highway it seems like you're more into it going a little faster at speed instead of a light to light kind of car. Whatever you do I would keep the rear end gears that you have. there are probably going to be better for passing on the freeway and stretching your legs on the highway then taking off the light. I would highly recommend a vacuum secondary Holley 600 carburetor with a heavy spring in the vacuums secondary so it will get good mileage and not kick in too early but when you need it it'll be there. maybe and mild RV cam and leave everything else alone as you want good gas mileage driveability and the ability to pass on the freeway. I would also work on stability, good low profile tires, good shocks ect. as those kind of cars were never known for good suspension at high speeds. You don't want to hit passing gear and swerve around somebody to make an exit and end up somewhere you don't want to be! My 2 cents again.

p.s.- that shift kit will have a great affect on the kick down to pass!