Poll I have the following exhaust manifolds from my 1970 LS5 coupe. Need some help identifying them and their value .

[GrandSport17]

 

[1st Vette]

View attachment 139581View attachment 139582

Check E-Bay motors?

 

[C8 route66]

1970-1974 big block left side exhaust casting date date on manifold Aug 28 73 (?) value $600 Can plus