Just installed my pan (and motor) last weekend...
Pictures of how precision fit the oil pan is with this 73-76 A-body spool mount type K-member. Threading a needle with the design here.
It fits the E and B body car fine as well as the 67-72 A-body type K-member.
Check this out for ground clearance!! Yes there is a pan behind that K-member. Actually 1/4" MORE clearance than stock because the stock pan has a bulge for the drain plug.
Here's the ultimate test.... Flat board is being held diagonally across k-member front passenger front to bottom of steering box drivers rear.
Awesome!!