Idle Issue

This is how my 64 225 looked. 97,000 miles and off the road since 82. One pic is the bottom of the oil pan and the other is self explanatory. I'm in the process of a complete rebuild.
If you are not going to go that far, you should definitely take the rocker shaft and rockers off and clean them. The oil holes in my shaft that feed the rockers were completely clogged and there are oil passages in the rockers also.