Ford Big 300 4.9L I6

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Welcome!  Glad you've quit creeping.  

On the EFI head and compression ratio, you might want to read this thread: 300 Six Compression Ratio, Intakes, Heads, etc.  And particularly, don't miss this post.

From what I've read it seems like the bottom line is that you can increase the MPG on the 300 with the right single barrel Carter YF or YFA carb, good distributor advance curve, and an overdrive transmission.  But, increasing power usually doesn't improve MPG - with the exceptions of raising compression ratio and/or going EFI.

Anyway, glad you are here.

Thanks - Have Read that Tread Twice, Really wish there where more inline 6's for sale in my area.