It's so smoky out today, because of all the fires in Southern Oregon, that I can't work in my shop so, I thought I'd do something that I've been meaning to do, that goes with this thread.
Jay's intake book lists the intake height at both the front and rear of the manifolds, based on the carb pad being level so, for the most popular manifolds, I did the math for the pad angles, based on those dimensions and that the FE block is 21.64 long @ the china walls. All Ford manifolds run 4.97 - 5.30°. Edelbrock made most of theirs +/- 3°, with the exception of the Street Master @ 4.97.
Ed 427 - 2.98
Ed 390 - 3.31
Ed RPM - 2.98
Ed St Master - 4.97
Ed Victor - 0
Ed Air Gap - 3.31
Ed F262 8v - 3.31
Ed F380 6v - 3.31
Ford 390 hp - 5.30
Ford C4 - 4.97
Ford CJ - 4.97
Ford MR 4v - 5.30
Ford PI - 5.30
Ford Sidewinder - 5.30
Ford LR 8v - 4.97
Ford MR 8v - 4.97
Ford 6v - 5.30
Ford TW - 5.30
Holley St Dom - 5.30
PSE TR - 3.64