[Okiespaniels]

I'm always torn about expressing an opinion on matters like this. However a couple of thoughts are in order. I'm making assumptions based on limited info.

Does the the "rebuilt" come with any type of warranty that even covers "performance" use? Any warranty is better than none, and most re builders offer one. You may not have that with your original short block.

Having said that... keeping your engine allows things to be "numbers matching" and you'll know exactly what was done. By controlling the process, you can control the quality. Yes. this costs more.

If you continue to race the truck, the longevity of a "cookie cutter" reman could become obvious, and expensive. Factory remans can be hodgepodge of parts and processes, which would not effect an every day type situation but may have consequences in a racing one.