Are there any major differences between a early '70 440 block and late '78 440 block?

I have a late '79 I'm thinking of rebuilding but was wondering if it would be worth it or should I stay with the early '70 block that is already in the car.....

Any block heads out there that would know??????

EDIT: It should actually say 1978 block. I believe it was pulled out of a motor home but I'm not sure.

 

Where did you come up with a 1979 440 block?

 

Oops, I have fat fingers and this is the price I pay.........

It is probably the last block ever built...J/K. It's a '78 and I think it's out of a motor home but I'm not sure.

 

What is the actual casting date ?

 

I'll check the casting numbers this weekend.

 

Ok, Here is what I'm looking at:

12-9-70
2586430-7

5-8-78
3698830440-9


Sooooooooo, what do ya' think??????

 

Does the shop you deal with have a sonic checker ?