Potential CMC Trade

I’m trying to get CMC. The trade would be

Send: Montgomery and Keenan Allen

Receive: CMC and Christian Kirk

Current Roster is
Murray
Kamara
Montgomery
Godwin
Allen
Hockenson
AB
Jamaal Williams
Aiyuk
Josh Gordon
IR: Michael Thomas

How much more should I give up in order to get CMC if I need to offer more?

Thanks