I built one car where the motor was about 3/4" too low and don't know remember if the following readings were from that car (poor document control...):
Top of chassis to front of block to
oil pan rail (without pan): 2"
Top of chassis to crankshaft centerline: 4 11/16"
I did say in earlier that I remember a 3/4" square tube between
oil pan and chassis, which would have been the lower engine?