Ok I will throw a wrench in this topic. I went and dug around and did google my block casting numbers and it came up with a 228 not a 224. The 228 has a 3 9/16 bore and from what little I have found on this website in reference to the 228 it sounds to me like it is a full presure not a splash oil, Now the oil gauge goes to 60 psi on the dash and I just assumed that it is the original gauge. I haven't taken the motor apart since I have made it run with a whole lot of elbow grease and some luck but I am also the type where if I cant get the parts to repair it I will do other things with the truck like mod it for a retro truck to haul my dad's truck around. Would this also be why on the serial tag the engine number starts with a letter and I know it is a replacement block since the first one threw a rod in it shortly after the truck was bought.
