340 piston question

[LImopar]

Just picked up a 340 from the cousin of a friend. He did not know much about the motor as he received it in a trade. As far as I can decode it is as follows:
Block 2780930 date 6 30 70
Heads 3418915-G J heads
Intake 3512100 date 6 23 70

Pistons marked 030 and have 4 small half circle relief cuts in them

Here are my questions:
How can Identify the pistons in more detail (ie. comp ration/type)?

How can I tell if this is a forged or cast crank motor?

Did any of the J heads come with the bigger 2.02 valves?

The lower end looks real clean and looks like it was a recent rebuild before it was shelved. I would like to just freshen it up. Is the intake that I listed above worth using?. If not what type intake and what type and size carb should I run. I am looking for just a streetable motor to put into my 70 dart.

Are the J heads worth having cleaned up or should I look for something else.
Thanks for any help?

 

[1wild&crazyguy]

are there any #'s on the tops?

is there what I call a 'belly button' in the center of the piston?

how many eyebrow's/valve reliefs?

4 eyebrow's=9.1
2 eyebrow's=10.5

 

[70aarcuda]

Just picked up a 340 from the cousin of a friend. He did not know much about the motor as he received it in a trade. As far as I can decode it is as follows:
Block 2780930 date 6 30 70
Heads 3418915-G J heads
Intake 3512100 date 6 23 70

Pistons marked 030 and have 4 small half circle relief cuts in them

Here are my questions:
How can Identify the pistons in more detail (ie. comp ration/type)?

How can I tell if this is a forged or cast crank motor?

Did any of the J heads come with the bigger 2.02 valves?

The lower end looks real clean and looks like it was a recent rebuild before it was shelved. I would like to just freshen it up. Is the intake that I listed above worth using?. If not what type intake and what type and size carb should I run. I am looking for just a streetable motor to put into my 70 dart.

Are the J heads worth having cleaned up or should I look for something else.
Thanks for any help?

the 4 small half circle valve reliefs usually inticates a low compression piston,,,
the high compression 340 pistons only had 2 valve reliefs them..
there should be some numbers on top of the pistons..
the biggest intake valve from the factory is a 2.02 intake...

just measure how far they are down in the bore....

 

[340_833 dart]

If it still has the '70 crank, it's forged.
Does the engine have the harmonic damper? The damper for the forged crank has no counterweights. The cast crank damper has a large counterweight on the front and is marked as for a cast crank only.