They won't clear with a 3/8" spacer, you will need a much thicker spacer and you may still have VC clearance issues. The best bet IMO is the short VC's from Trick Flow. I'm running them with my Probe Shaft mount rockers and they cleared everything just fine, including the alternator. I am running a thick fel pro VC gasket though too for added clearance. I didn't check them without this thick gasket to see if it was needed or not, I just used it to be safe as i used it with my old stock VC's.