pay a shop to do it!
unless he goes back to SDHQ, even that mindset aint worked!
Definitely fix the timing chain buddy. it would have to be REALLY stretched to cause timing issue mechanically but if the holley setup uses the cam for ignition timing, it can fuck it all up tuning wise.
after my most recent SDHQ bill, i cant afford to take it to another shop!!! haha
but, yes. i will for sure get that taken care of if i drive it any farther than a few miles...... UNLESS a smoking hot biatch at yoga wants me to give her a ride, then ill drive it till it breaks down and the smoking hot chick and i get stranded!!! hahaha