Oil restriction ??s

Goldish material's kind of vague. Which rod showed hot? Witht he rpms you're turning, I'd say either you need to get much more meticulous to verify things are perfect yourself, or trust the machinist. If there are signs of a problem, regardless of reputation or intent, something was not kosher. For what you're doing, the stock oil system is fine, provided there's sufficient drain back and splash control and the clearance and finish on the crank is perfect. Start with the basics. It might surprise you how little needs to be done on a drag racing engine.