Best and secure way to connect 2 cores

Hello,
I would like to know the best and secure way to do that :
PIX2 ethernet 0.1 --> Catalyst 3750 --> Catalyst 4006 --> PIX1 ethernet 1.1
the catalyst 4006 is the VLAN manager both of the pix use subinterfaces
for the moment i configured the interface on the 4006 as trunk but i am not really good with prunning allowed vlans
Can you please give some help ?
Regards,

sorry because i am french ;) what i want to do is to share only one vlan between the C4006 which the vlans root and the C3750 because i use virtual interfaces on my Cisco PIX's so vlans need to be configured.
What i don't want to do is to allow other vlans on the C4006 to be distribute through the C3750 which has already some vlans that can have the same vlans id.
Regards,

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