Originally Posted by 68Gold/white
Sounds like a hopeful minor problem....
Make sure all the plug wires are where they need to be, on the cap, and engine...
As a rule of thumb, an engine that accelerates sluggish, needs more advance. Get it running, try moving the dist around, see what happens. Be very careful, since this thing's in the backfiring mood...
Look at your old cover, compare it to the new chrome cover. try to make a mark somewhere w/ a sharpie, to give you at least a close estimate on timing.
Yes, check timing w/ vac advance disconnected. I'm guessing your combo is close to stock. The timing should be around 8-12 degrees BTDC idling.
Take the carb off, make sure the carb base gasket you are using, isn't leaking vacuum.
There should be an imprint on the top and bottom of the gasket, where it's making contact, it will tell the story, good, or bad.
Plug off the PCV valve, see if that helps, I used a cheapo valve here recently, it caused problems..wanna guess where it was made??? (not USA)
The backfire could be from a minor vac leak, check the carb, as stated earlier. New intake gaskets seldom leak. make sure the bolts are tight. 30 ft/lb is all they need. I never use a torque wrench, make sure they are tight within reason.
When you get all this under control, check the intake bolts for tightness, when the engine is completely cooled down (as in after it sets over night). The intake bolts need to be rechecked for tighteness. 2-3 times, until you recheck them ,and they don't loosen up any more (all this has to do w/ aluminum expanding when hot, more than iron)
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