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'75-79 250 and 292 used external mounted coil HEI system,
80-up used coil in cap on both engines, can rob the HEI from any of them for any old or later L-6 engine
stock GM one wil be plenty, trust me.. external coil is just as mean as the in cap variety, just make sure that you get oen that does have the vacuum advance diapragm and not a flat wire plug with four wires, on other side of the base from the regular wire plug. all older thna 87 or so L-6 engines should have the oldr conventional HEi that you need to find and swap on.
dont use the original small feed wire for the HEI, ru a new larger one directly to the fue panel with a female spade connector to pug onto male spade connector at bottm face of the panel where it says IGN UNFUSED
you should use an inline glass fuse setup in the wire for safety reasons, make sure the fuseholer wire guage is same or larger than wire you run for the new feed source to the HEI
good luck
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