Wow some good info here!!

I have a 2001 1500 4.3 auto 134k miles.

The engine is getting tired and I flat tow my CJ7 and I would like a bit more power on the hills.

Just a short recap: 4.3 to a 2001-2006 5.3 swap

I can keep the transmission (Just got rebuilt a few months ago)?

My 4.3 PCM reflashed for the 5.3? Better if I can get the ORG PCM for the 5.3 being purchased?

I can use the org engine mounts?

New fan shroud

New hard fuel lines? (frame to engine)

Keep org alternator?

Missing anything?

Thanks,

Carnell

p.s I found a 5.3 (with pcm) for $675 out of a 2001 Tahoe. Not sure how many miles but I have time to do a mild rebuild if needed.
I can't spend anymore then 1k for a engine. Is that reasonable?