I'm with WALDO53, I would have the vacuum advance checked. Many of the older distributors had adjustable advance canisters. Also the advance plate it's self may be frozen It may idle decent but not advancing the spark under load.


~ Craig
1958 Viking 4400
"The Book of Thor"
Read the story in the DITY
1960 Chevrolet C10
"A Family Heirloom"
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'59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)

If you don't like driving yourTruck, you won't drive yourTruck..| Living life in the SLOW lane