[VWNate1]

No spark plug range change .

My old 250 is plumb worn out and passes a LOT of oil so I had to upgrade to the stock 1976 HEI or scrape the plugs every 200 miles...

Just open them up so the HEI can do it's thing then set the timing to 0° ~ 8° BTDC @ idle , no vacuum signal , once you have that done , use the idle stop to set the idle to 700 ~ 1,000 RPM hot in neutral then S L O W L Y turn the mixture screw in as you watch the vacuum gauge , ideally it'll climb and the engine idle better/faster until the needle begins to flick , then stop and back it out 1/8 ~ 1/4 turn and go for a drive , see how she goes , if it diesels you can set the idle speed back down to 600 RPM but it's better to use the original idle solenoids , the brackets are hard to find but the 305 V-8 uses the same idle solenoid with an additional bracket that easily snaps off by bending with pliers .

If you have the electric idle solenoid , use it to set the tune then disconnect it and use the carby's idle stop screw to set the idle to 400 RPM's , this stops the designed in dieseling .

Let us know how it all works out .