Glad you went through the math - Yes, I made an assumption of the injector firing once per two engine revolutions.
I don't have the answer for TPI injector firing every one or two revs ... suggest you search and if needed post on the GM EFI subforum here
http://www.gearhead-efi.com/Fuel-Inj...GM-EFI-Systems
Both good searchable threads and knowledgeable people over there who I'm sure can help.
Jim
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