I replaced the entire motor in my 85 Blazer about a year ago with a 350 from Jasper. Lately I started having carb troubles, so I decided to just yank all the smog do-dads (most of it was unplugged anyway) and get back to basics (inspections are not an issue). Anyway, I now have an Edelbrock carb and a set of headers and all of those ugly vacuum hoses and pumps are gone. EVERYTHING in the engine compartment except for the intake is now new stuff. I had to block off my EGR valve to get the carb on. Now I have a detonation problem I can't get rid of. I've installed colder plugs and jetted the carb richer, but I still can't make it go away even if I unplug the vacuum advance and set the timing to 2 degrees AFTER tdc. I've ordered Edelbrock's EGR adapter, which will hopefully allow me to reinstall the EGR valve. So then my question is what do I connect the EGR vacuum to? I'm thinking the timed port on the carb, but maybe that's not right. Can anyone give me a little insight into this problem? Please spare me the "You'll burn in smog-control hell" sermon.