Chrysler 440, the staple of cop cars for years.
Hard to argue with the 350 Chevy as #1.
I also loved the 225 slant six. Great little workhorse with surprising power for a small engine. Owned a few Darts and Lancers back in the day.
Chrysler had a hyperpack upgrade for the slant six that let the Darts and Valliants run with the pony cars. There was a rumor going around that seven Hyperpack cars finished 1-7 in a compact race at Daytona
The Chevy 292's were good workhorse motors too. Lots of torque on the bottom end. Pull the head off and turn the crank, and you'd watch the piston drop down the hole and wonder if it was ever going to turn around and come back up.
The lineup includes quite a few expensive V-8s for their time. The Slant-6 was a very durable, consumer engine. That’s what most of us poor folks had. The 426 Hemi was certainly drool worthy, but how many people actually could afford them? Not many in my neck of the woods.