340 or 440

Build a 360 right, and it will feel like a warmed-up 440. Add a couple of gear sizes, and she will really scoot. Add an overdrive and torquey cam and she can eclipse a smogger-teen as to hiway fuel mileage.
'Course it don't come as cheap as the 440/2.94/3.23s...... jus saying

Yes, I'm a small-block streeter guy; 360s actually. But I spent a lotta lotta money on my combo. It's nice and all like that; but after you figure in the costs of an overdrive and a third or fourth pumpkin, so as you can hit all the bases.......
I couldda just started with a 400 or something, and learned to feather the throttle.