The Near Idle / Off Idle tables are for TBI computer 16197427, the 1227747 is similar but with one fuel table and one spark table. Similar looking spreadsheets can be made for the 1227747, http://gearhead-efi.com/Fuel-Injecti...Information-42 post #7.
Is the Holley / Duraspark distributor using the GM 8 pin ignition module? http://3.bp.blogspot.com/-Huj3_ztl5U...7+ignition.jpg
dave w
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