Packet Mangling, conn_tracking

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Hiyas,
I am interested in performing some packet mangling,
preferably in a Userspace QUEUE.  My general goal is
to obfuscate packet contents (IP payload and below)
'on the wire' between 2 hosts which both have the
QUEUE application, so:

HostA
  |    (Normal packet)
FW Router
  |
  |    (Mangled packet)
  |
FW Router
  |    (Normal packet)
HostB

Since I want to mangle the IP payload (including
tcp/udp header), I was curious about where I could do
it so that it was demangled before I do filtering
rules and before any connection tracking was
performed.
If I establish a QUEUE for the mangle PREROUTING and
de-mangle an incoming packet, will that make the
contents of the unmangled packet available for INPUT
and connection tracking?

-Scott 

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