Not familiar with E-carbs, only mess with Q-jets and Holleys.
But the plan sounds good.
If the valve springs and push rods are stock, replace'm.
Use 7/16 rocker studs and poly locks.
If not pull'n engine, pull cyl hds and enlarge chambers for less compression.
Or find #64 or 6X-4 heads. Theres a couple more, but cant remember what #'s right now.
3.42 to 3.55 gears should work well.

Oh ya.
Unless Cliff's caught up, figure a lead time.