The Moelis Blueprint includes seven valuation methodologies ranging from $159-315 billion.
In scenarios where there is no legislation to add multiple guarantors and market share caps, I use $200 billion (simply assuming $20 billion annual earnings and 10 P/E that give 10% return).
I see market caps of around $150-250B combined. That's a bit lower than Moelis, but I think Calabria will curtail FnF's reach to the extent that he can do so by himself.