440 comp ratio..!!!!!

Depending on head volume&gasket determine the C/R.This is a list of what the ratio can be with different head volumes.
Compression Ratios
72-11.5
80-10.6
85-10.2
90-9.7
You will land up most likely with a 10.4:1 ratio as a good starting piont.get the specs and see if you will reface the heads and do a valve job,new valves,and if you will use steel shim head gaskets to figure the final ratio,mrmopartech