Stock 400 Piston Boost

With 7.7 compression and 5 PSI boost, yall really think it's need boost retard?
About 36 degrees of static timing with the coldest plug it will reliably run with and 20 degrees of start retard and you’ll be fine. Somewhere in the 12-1/2 % under drive range should deliver around 7 pounds of boost. The water meth injection is a necessity, though.