Cam choice for low comp 360?

The problem building low end torque its hard to improve on factory.
As you add cams heads carbs etc... you expand the factories idle to 4500 powerband you can add 1000 rpm to idle to 5500. Above that you start moving the powerband to much of idle needing stall and gears to keep your car in the powerband. But if you want more than stock torque at about 1.1:1 lbs-ft to cid. The only way is the opposite of what's told to you. You need to gain more and more airflow to gain more torque it will be just higher up the rpm ladder. Mild builds can get you up 1.15:1 pretty hot engines is 1.2:1 and going above 1.3:1 for use average joes is a lot. Professional builders can over 1.4:1 I don't think there's to many over 1.5:1.

So it actually takes big cams heads carbs intakes headers to make torque.

But for your application with 3000 stall and 3.55 and especially 3.73 you can get more off idle somewhere between 1500-2500 and most built 360 are gonna peak between 5000 to 6000 rpm (350 hp to near 500 hp). Your compression is holding you back cause you go probably with xe275h but with the low cr with the 3.55 I'd go with xe262h and xe268h with 3.73.