Thanks for the replies received.
That answers my 8-3/4” question.

Now - going from a standard Dana limited slip to a spool.

Best I can remember the weight difference was around 40+ pounds.

Been bench racing and using the Wallace Calculators on the engine side of things.
Now trying to figure out how much if any one would expect to lower their e.t. by

1) Going from 11” drum brakes to drag race weight disc brakes
2) Merge collectors vs. standard
3) Eliminating the water pump drive ( going to electric drive drive )
4) Eliminating the mech fuel pump
5) 904 vs 727 with 2.45 low gear. ( heard .10 e.t. reduction )
6) production windage tray to scrapper ( heard 18-20 hp)
7) 70’s era stock eliminator cheater cam to current designs allowed with higher spring rates, etc.
8) Diamond piston versus old cast piston used in item 7

If anyone has real world testing results I would appreciate your responses.
If no actual track testing then actual dyno test results would be helpful too where applicable
Vehicle is old stock eliminator 69-1/2 car.