I can relate my personal experience with the K cam---have had one in my '69 144 warmed over B20B for many years. I have also installed many D cams in stock motors while working at a Volvo indy--road tested them but never "lived" with a D cam equipped car. My motor has the original bore (with select fit "G" pistons and NOS Volvo rings), later 44mm intake head (with hardened exhaust seats installed), high (about 11:1) compression ratio, exhaust port matching and some cleaning up in the pockets, '75 Bosch electronic distributor and SU carbs. It is at least as quick as any (stock) B20E I've driven--has gobs of low end torque. You could get the car rolling at idle speed in 3rd gear and drive off without a hitch as soon as the clutch is fully engaged (I don't do this often--but have done it to demonstrate). If you are running a single down pipe now you will be amazed at the performance you'll get after a new cam and the twin downpipe exhaust. -- Dave