Got a 408 sbc redone by a reputable shop last winter. It has Keith Black flat-tops with 3/16 Total Seal TSS rings and World Products S/R heads and a Comp 280/288 .510/.520 hydraulic roller. The heads spring pockets were opened to accept 1.437 springs and new seals were put in at that time. It now is using an extreme amount of oil (1 quart in 50 miles). I did a compression test on all cylinders and was running 175psi on 7 cylinders except number one which was 155psi. Number 5 plug is oil fouled on a regular basis with the rest at a light brown. My vaccum holds at steady 15" at 900 rpm. The intake runners inside got a small amount of oil inside and the drivers side exhaust has the smoke out of it which would explain number 5 being oil fouled. I am running a hi-volume oil pump which Total Seal says will cause the motor to use oil. I am stumped since got good pressure in number 5 cylinder along with good vaccum for the cam I run and cylinder pressure. Would a bad valve guide cause this much oil consumption or am I missing something obvious?