'70 318 BBD falls flat under load

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Try turning the idle mixture screws counterclockwise 1/4 turn out (richer) then go for a drive, try another 1/4 turn, another drive and see what happens. I did this on mine and it cleaned right up and didn't soot the plugs at idle.
 
Tried all suggestions and it never got better. I opened up the '74 BBD and cleaned it up, replaced some gaskets from ones I've had from past projects and the Swinger runs great again. Guess I'll ditch the '70BBD. I've bought some time until I decide what route I'm taking.

Thanks everyone
 
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