Is it Worth rebuilding if not original engine on truck

I’m a rookie working on cars and trucks I’m glad I found this site a lot of good info

 

You engine looks clean should run well they sound like a sewing machine at idle slight tap tap tap don’t trip out (I did) when the distributor moves back and forth when you push on the gas pedel I see duel exhaust so split manifold

 

Look at what I found on the last pistons
What can that be

 

You should hear it now it sounds way better than what it did that’s just replacing a few things next is a tune up
It starts and stays on but once I try to go in gear it shuts off that’s where I’m stuck trying to figure out why

 

Could be the float In the carburetor you said you rebuilt it maybe not enough fuel the experts here will chime in with a solution

 

Ok good thanks for all the info so far

 

Yes I have split manifold
My 235

 

Just a thought is the plastic piece and gasket that’s between the carburetor and manifold on correctly or new old one might have cracks that aren’t visible creating air leaks

 

Are you suppose to remove the old completely it is stuck and it’s all damage I ended putting the new one on top of it what can I use to remove the old one completely

 

I would put a rag in the manifold hole block anything from falling in scrape it good not to gouge the metal

 

Thanks bro I will do that next week I go back to work tomorrow thru wendsday . What does your schedule look like how soon you want this done

 

Do you have a welder?

 

Why are the last 3 rocker arms white? Look like they have powder on them.

 

If the engine is durable and will work for long time, so i would suggest to rebuild it, i had ford 1996 diesel truck that engine was good so i rebuild totally now i am using that for roadside service near me, i have been using that for 2 years and working great.