360 vs 383

A 383 roadrunner used to run at our track in '68. It had 4.10 gears, headers and cheater slicks and would dip into the 13's. The 4.10's made the difference.
If you made the same changes to a 68 340 Dart they would flirt with 13 flat and a good one high 12's
i wonder if our junior members know what cheater slicks were?