What to do...

PRH said

For 11.50’s and 118mph it does seem like the 60’ is lacking.
When I had the 383 in my heap running similar times it would 60’ about a tenth better than that 1.65.

I don’t recall your cam exactly.....high 250’s?....... I think at that elevation with a cam that size, foot braking....... 5000-5200 or so stall, min.
Imo, it needs an 8” unit.

The speed is pretty good...... just gotta work on the front half.

Have you done a timing loop and determined 32* is really the sweet spot?

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Cam is Howards Solid Roller - 257/267@050 .640/.645 .022 lash hot
Below 32 and I lose a mph.. above 32 and it gains nothing. 32-34 is no difference except the starter doesn't like it, that extra 2degrees is guess is it's limit.
With the 10degree bushing and the lightest springs, it mph'd 117.6. Only change was the front shocks and locked the timing at 32, 118.6 on pretty much all passes not including the aircleaner pass. low and mid do seem to run MUCH smoother with the distributor locked out.