C1500 engine 305 or 350???

[90OBS]

So I put new pins and bushings in my 1990 C1500 short bed. When my buddy and I started talking about the motor.

When I bought the truck the owner said it was a 305. The sticker on the fan shroud says 305. The Vin (8th digit) calls out K (5.7 350). RPO calls out (L05 5.7 350)

Engine casting code (kind of hard to read) located on back side of motor ,drivers side. *see picture * 1st picture

Engine serial number ,front of motor ,behind A/C compressor,passengers side *see picture*

This is driving me crazy trying to figure this out.
What do you guys think?