For sequential on an Domestic EFI engine and XFI I usually use a MSD crank trigger 3/16" or Fast crank trigger 1/16" and mod a MSD billet distributor. It has a much better clean signal than any dual sync and is very easy to install.
The XIM coil on plug works great, I have changed over several of them on big block chevys and it really will wake up an engine. LS1 coils are the norm and work very well. It is a proven setup so there are no worries.
There was some good and bad info in this thread, I will try to be available as much as possible for any FAST, Accel or Big Stuff 3 tech or tuning questions.
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