Jeff....I can send you the OEM valve covers off my mock up motor if you want to measure and play with them some.
I dont see an issue with the oil fill plug being on the valve cover, but if you keep the stock coil mount locations, there wont be much room if any at all. The coils take up most of the surface
Personally I want to move my coils......remote mount like some of the LS stuff or under the manifold, like Bruning did.....
They look the same side to side..... I'm pretty sure the 5.7 vs 6.1 is the same...not 100%
Let me know if you want me to send them to you...
Ned
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