The Stay At Home Dad 273 Build.

Surprised you feel more low-end torque since your cam has much more lift than even the factory HiPo engine. The adapter might have helped since that gives you 4 holes and I have read that 4-hole manifolds are better on the low-end.

I put a hydraulic cam (0.422/0.444) in my 1965 273 w/ Rhoads leak-down lifters. They claim to give more low-end torque, smoother idle, and better mileage, but I have no basis to compare. I got several sets on ebay, for as little as $25 I recall. I may try on my other cars.