Engine swap

[Pat:Man]

Hi maybe someone can help me with my engine swap issues !

 

I have a Silverado Sportside pickup from 1989 with a 4.3 Liter V6 engine.

 

I have now removed the 4.3 L engine and fixed up the engine room with new paint and wiring and so on..... and i am about to put in a 5.7 L V8 from 1989 to get better perfomance.

 

My Question is:

 

On the torque convertor it is a label with: 8653702 on.

 

Must i change convertor for the new engine (5.7 L), and if so are there anything else i must change ?

 

If so what convertor number is for 5.7 L V8 engine (Gasolin)

 

 

Best Regars from Finland

Patrik