Help identifying engine

[El Dorado Jim]

Originally Posted by Socalrider87

I’ve tried looking for the engine stamp on my engine but can’t seem to find it. The truck is new to us and I’m trying to find out what engine is in the truck. The truck is a 1970 C20 Longhorn with V8 400 badges on it. I need to get a new carb and do a tune up on it but am stuck in the water as far as what parts to get. Reading thru the forums You guys are some very knowledgeable guys so I’m hoping someone can help me figure this out.
Thanks

if it's the original engine it is the 402....