Spark tables can be taken from iron head, B body LT1 or from OBDII Vortec engine. Reportedly there were van engines with L31 Vortec engine and TBI intake. Edelbrock Vortec TBI intake was originally designed for these engines!! Look for that cal and maybe you've got something. These cals might be from a Vortec head engine with VE tables for a mild cam to get ya started.
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