Want to buy these valve covers. But will they clear the brake booster??
This is for 402 BB with standard heads and original delco moraine booster.

http://www.cfrperformance.com/HZ_8051_p/hz-8051.htm

A friend of mine has tried a set very much like those on Dart aluminum heads in a 70 Chevelle. They don't fit with the power brake booster.
The Dart heads have a slightly taller valve cover rail, so they may work with stock GM heads, but I kind of think not.