im of no help in the lithium battery department, but i am running 16 volt system with my holley efi, a converted 12si alternator, and a 16 volt turbo start battery. more is def better in my experience. I was running it with the carb and magnafuel 500 pump for better starting this car will never go back to 12 volt. i may be able to get a cranking rpm number for you next time its off the storage lift.
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1968 firebird cameo white on red 400 4 speed
1969 carousel red firebird 455, richmond 5 speed
1964 gto pump gas, 505 IA2 EHeads, EFI, 92 mm turbo ice cream getter in process now....
1970 lemans hardtop, gto clone Atoll Blue
1972 Maverick powered by 2004 gto ls1 and t56 6 speed, 8.8, fox strut front end, wifes car
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