Funny. I just took apart a 390 that I built in 1982 that has sat for a long time. Ran it hard in 81 to 85 with a REED roller cam in excess of .600 lift with triple springs. Never had a walk plate or oil line modification. The front cover has ZERO marks on it and the rod and main bearings came out like the day they were put in. This was a SCCA car that saw a lot of time at 6000-6500

Is the cam walk plate a necessity? From what I see in the motor no, but I;ll put one in to be sure.. OIL LINE MOD NO