Are the 4.3's interchangeable?

[CrystaledJazz]

I might be able to get my hands on a free 2011 Chevy 1500 with a 4.3, which I think is the LU3.  The only issue is that the engine was starved of oil, and its done.  I have an old 4.3 out of a 2000 GMC Jimmy which I think is an L35? correct me if i'm wrong.

would I be able to interchange parts off of each other to make 1 good engine that would work without too many modifications?  It needs to be cheap as I am too broke to be doing this in the first place. 

Any help would be great, Thanks!

[CamGTP]

This is probably answer your question.

 

For the 2007+ GMT900 Silverado/Sierra trucks, the LU3 engine received a Distributorless Ignition System - the traditional distributor was eliminated where a stub shaft was used. Also the crankshaft sensor was upgraded to a 58x reluctor wheel (same as the GEN IV LSx) which resulted in the timing cover redesigned (this time the cover is aluminum alloy in lieu of the composite cover; the timing cover bolt pattern is not the same as the 1996-06 LU3 and L35.

 

 

So, it's not going to work.