Header fitment

[maxreps]

Can anyone confirm that my beliefs are right or wrong about the 2 different headers below fitting my '76 w/350ci, auto tranny and AC. I know that camaro headers are supposed to fit our trucks but 1 of the ones below is for older models and the other is for slightly new models...
Also, will LS1 or LT1 headers fit properly or not?

Flowtech #387-11102
Standard Headers
82-91 Camaro
78-87 Chevelle
78/87 Olds Cutlass/442
78-87 Buick Regal
283-400 SBC
Primary Tube 1.5" O.D.
Collector Size 2.5" O.D.

Flowmonster part #1115-BK
67-69 Camaro w/o Air Conditioning
70-81 Camaro -ALL
64-72 Chevelle/Malibu
73-79 Malibu
68-78 Nova/Chevy II
65-76 Bel Air, Biscayne
66-94 Caprice
64-79 Impala
70-87 Monte Carlo
64-77 El Camino