Another Disc Conversion? Proportioning Valve Options

Hey folks,

Yet another question as I compile the parts for my Wilwood front disc conversion. Looking at proportioning valve options and considering this Wilwood adjustable unit, "Wilwood 260-8419 Aluminum/Steel Knob Adjustable Disk Brake Proportioning Valve" or the Mopar PV6070MOP piece that includes a new metering block as well as the proportioning valve.

The adjustable piece is appealing, but I am wondering if I will need to get a new metering block? Or can I retain the OEM metering block (Car came with drums all around)?

I did a search which only resulted in more questions! LOL!

Thanks as always,
Pat