Pretty sure the injection is the same as the old non turbo 6.9 and 7.3 International diesel V8's Ford used. As said high strength ARP studs and either MLS or Copper head gaskets with O rings with the receiver grooves machined in. You can also get a custom cam ground, it could be flat tappet or roller, depending on the year, of course this is about the only Olds that the piston to valve clearance would need checked with 22.5 to 1. Unfortunately no decent timing set exists, due to the injection pump, no doubt it will need a new one. I say add headers, regular Olds V8 headers fit, dual exhaust and ram air as well. Also consider a 2004R trans and 3.42 and up gearing to help this doggy diesel in the acceleration department and keep rpm's low for 30+ mpg on the highway.