[Coley]

Ok...I'm reading two messages here:
-You want to fix some engine leaks
-You have a Vortec package you want to install

...so what is the priority?...no leaks?...or installing a new Vortec package?...noting that one might not solve the other.

now, you don't want to pull the engine...fair enough....you might not have the space, tools and overall set up to do this....and it isn't an 'afternoon/overnight operation' for 95% of the population and once the engine is out....you are looking at a boatload of time before you probably will want to put it back in...because you will suffer from 'mission creep' once you see the engine is out of the truck.

So here are a few initial thoughts:
-Determine 'where' the engine is leaking oil from first? ...valve covers? intake? timing cover? oil pan? ....where?
If you do a Vortec upgrade you might eliminate a bunch of the leak points in the process.
....so I would start with seriously determining exactly where the leaks are coming from first.

My two bits
Coley