Not A T,
thought this was going to be a easy one till I looked in your gallery!
with the new timing.... 14base/24cent/10vac= 48* total just cruisin' 65mph....Hg should read 18"+...the 383 is totally loafing in your light car....
at 13-14Hg you are "tipping into" a richer mix/lousy burn...due to the 3 dueces????
"if" it is now 18"/65mph, and your vacuum can is adjustable....I would use 12/24/14Vac for 50 total cruisin'
depending on your cam and CR....I would be a little careful....WOT with 38* can be ping/knock
what does the Hg read on a mild downshift engine at temp?...