This thread is an excellent idea. It should be made a sticky, so it can be found and added to, easily.
I think, now, after many questions, that the Code E and the later, Code A, are so different, that they may be considered two entirely different engines. And, within THAT, there are, for example, THREE different Code A engines, just based on anti-smog regulations. We have the 49-state Code A, the California Code A, and a "mystery" Mountain Code A. What GM did to that last one, to make it run at high altitude, should make it a *hot rod* at sea level. "Sea level", as in where the ambient air is more dense.
Looking at it, the Mountain Motor probably has a different tune in the brainbox and mechanically, perhaps a different
MAP sensor and/or injector, although I haven't found it listed in the on-line parts catalogs from places like Napaonline...the MM is probably one of those "rarest of the rare" items, and as such, may not even be listed.
Where I am going with this: Can a lowly Code E engine be "converted" to a sea level MM with fairly simple mods like a MAP sensor swap?? You would still be strapped with all of the Code E deficits, like the headflow restrictions inherent to the design, but you would gain in output at sea level. Where the air is more dense. This all could be a dead end. However it certainly merits more research.