Is "all original" worth keeping a 305?

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Hey guys! I purchased a (total CRAP) '86 GMC that was promised to be reliable and get me to Texas with no issues, but which is yet again sitting in front of my Mechanic's to chase a wire issue, after already having to replace the starter, battery, AND carb. Really, it makes me sick to think about.

In the mean time, to get me down to Fort Hood before my PCS leave ends, I found a super straight '84 K-10 Scottsdale for a song. Runs good... smokes like it's getting paid to do it, though. I definitely have a valve cover leak on the passenger side and most likely a good bit of blow-by as well. Fixed the breather tube slipping off to stop the regurgitated oil from seeping onto the headers for the time being, but this truck was bought with the intent on getting me to Texas and around post until my car makes it back from Germany, at which point it will be a really awesome project. This leads me to my question:

This '84 is all original. Totally. When rebuilding her, is it worth keeping the 305 (as opposed to going with a crate or rebuilt 350) due to it being the original equipment? I know 305's won't ever make as much power as 350's, dollar for dollar, but you know what? I don't need a powerhouse. I need a good, reliable truck. That's it. But really is it worth keeping the 305 and rebuilding her for collector value?