1997 4L60E to Vortec 5.3 or 6.0L

[autowrench]

Thanks for the reply! Ideally, I will get a matched engine and transmission . One of the engine sources I am considering does not have transmissions. That is why the used one was an attractive idea. I was thinking I might have to grab that transmission before I have an engine, but the best plan is likely what you suggest. Wait and see what engine I get and get the best transmission I can. I remember there were a lot of 700R4s being rebuilt in the fleet that I worked for when they first came out. We did not rebuild them ourselves and I remain in the dark when it comes to automatic transmission internals. Anyway, Thanks again!
Tom