oil pressure and clanking noise no power in the engine cant accelorate

hey man i took it to my brother and his buddy there both mechanics they told me run a manual oil pressure check and i also have an oil leak that he said seems to be comming from the intake manafold and idont know if its the right or left side of the intake, ive read some other peoples problems on here and they sound the same like the oilpressure sender switch going bad and then something about the oil pump also going bad but im just trying to find a place to start without having to buy a whole new engine block cause i cant aford that and my truck is basically imobile at the moment it makes a very loud clanking noise like a bent rod and thats what my dad said it may be but my brother and his buddy both said it didnt sound like that it sounded like it was under the head gasket somewhere do you as a master tech have a recomendation as to a starting place?

try starting with a compression test.if you have a bent rod you will have low compression