If your mopar is you daily driver!

lot of good info there. what about engine temps? they effect efficiency in different ways, right?
i have 3.73 and a .75 and .5 od, i didnt think it was going to work well at all, figured id have to go to 4.10 but figured id give it a try first. 5th is useable down to about 40-45, 6th around 60 mph and faster it works pretty good. i looked at tire size and gear ratios for cars that would have come with this trans. i used a small cam close to a factory hp cam figuring the only way i had a chance of it working would be to have peak torque come in pretty early, but of coarse i wanted to have some power up top. i pulled some plugs after some serious highway miles and they are really clean. i was thinking it might have a hard time cruising along at 15-1700 rpm but it really does pretty good. i think i should be able to get 25 mpg ideally, but right now im dealing with a low compression 400 that i honed and threw rings in. it isnt really the optimum combo, but its sort of a balancing act of what i had and what was in the budget. i figured id see how it all worked and then i could plan a real build. for a cruiser i definitely like the small cam and the quiet exhaust.
some things im considering, would be some fresh air to the carb without a hood scoop, hhr electric fan, and maybe a small air duct under the front bumper to help smooth out air flow at highway speeds. if keeping a carb id ditch the holley 3310 for either a 600 or the thermoquad.