The 3101887 has both. its being used as the 2 bolt because the person I bought the engine off of told me it was originally the 4 screw valve cover and he converted it. I still see the four holes where it meets the head however it is attached by the top two bolts. A little confusing huh. The motor the head sits on is from a 1955 235 motor, #3836233, 07250 59F55Y.thanks guys for all the help
"As I lay rubber down the street, I pray for traction I can keep, but if I spin and begin to slide, please dear God protect my sweet ride." -Amen
56 Chevy 3100 
