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i see a lot of post about how much hp with these engines with bolt ons . That's not what I care about. I care more about the torque because that's what I will be doing just driving around town. Now what kind of torque will I get with headers, 4 barrel carb with aussiespeed manifold, Maybe a comp...

I have a 1975 dodge dart with a slant 6. Yesterday I checked the cast numbers and they came up as a 1968-70 cast slant 6. Now my question is since in 1975 the slant 6 went down 90 hp and the 68-70 the slant was rated 145 hp is there anything different between the blocks or is it all smog...