To add to what HotRod Lincoln said, you can also stroke a 350 to 383 c.i. put fuel injection on it and get even more torque. And I agree, if you are looking for low end torque, forget the 327.
if it comes to that you can also stick in a 572,
the question was though about a 327. maybe he likes 327's and nobody has honestly answered his question except to put in a bigger eng
I had a 212 cu in eng in my truck that would pull the [censored] onff most 350 engs. they say that size is not what matters but how it is used
my brother put a 454 with 750 ft lbs in his 28' fish boat 20 years ago. the motor only cost him about $28,000.00 20 years ago. the boys at the DDA shop where they ran it up on the dyno had their eyes popping when they read the values. that torque never really did him much good but was just a by product of what happened in the build to get him to another opening 200 mi away for another opening the next morning. it didn't bring in fish any better but got him there to more openings so that he had the opportunity to catch more fish.it did cost him 125 litres of gas an hour at 3/4 throttle
ron