Hi Scott, i have gotten a few sets of the 340 valve covers you show in the first pick over the last 8 months or so and for what its worth a few sets of "standard" sb covers, i have noticed all the wire stands on the drivers side where in the same spot to the 32nd of a inch this includes the standard 318 ect.. covers with the short stand, I did notice they very in orientation like some are at say the 11:00 position and some are in the 11:30 position you can see that in one of my pics. As for the heat sheild i always thought it was for the t-quad cars with their wider carb bodys moving the choke linkage and well very close to the V/C. I thought it was a late 70 on some AVS cars, and 71 only thing but i/ve had guys tell me 69's would have those to, so i'm very confussed about the sheild also. I think the whole V/C was painted orange including the sheild but i'm going to keep the sheild black for some contrast.