cooling on 3 head sizzler

[SuperDrifter]

Coffman sizzler 3 head line routing. Finally figured the simplest way to run lines. Cutting off second inline, from pump. The first inline has plenty of pressure (oversized). Don't want it to run 'too cool'.

I'll test the VFR on the trailer, by detaching line to stinger. At what RPM should VFR open?

I realize few PP have the sizzler, so thanks to orangefinger for helping!