Still Too Hot

Thank you for the input, a lot to digest in all of that.
Looks like I am worrying too much about keeping below 200-210*.
Just a few comments:
-too tight to fit high flow fans & shroud (21w,16h,>3.5d).
-current setup spec'd at 2200cfm which was enough to cool a 451 stroker at drags.
-hated to move to electric but will not go back unless it were OEM resto.

I like the comments on trial-and-try, that gives me something to work on.

I will be working on the bypass setup just for my own satisfaction.

Consensus is a shroud is necessary to lower temps.

One thing for sure, I will be posting results.