Okay...... let’s explore that option.
Buy a pair of castings without waiting for the Black Friday sale.......(currently $798/Pr at Jegs).
Do them up just like what’s on your truck engine....... finished, all new parts, ready to bolt on for a HR cam that’s suitable for 500hp.
What’s the bottom line?
Then.......how much more if you’re 1/2 way thru the job and the buyer calls and says...... he’s thinking he really wants more like at least 525hp?