Sounds miserable. For those top bolts I always committed to pulling the intake right from the start and laying on top of the valley. You can pretty much reach everything from there with a box wrench.
How oveled are converter bolt holes in the flexplate?
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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