Question for those who have used Speedmaster assembled heads or valve springs

Wondering if anybody on here has ran these Speedmaster heads

Mopar Chrysler SB 318 360 170cc 65cc Hydraulic Flat Assembled Cylinder Heads

or these valvesprings they sell (these are the ones loaded on the heads that come assembled in the link above)

1.450" Od. Dual Valve Springs w/Damper - 145Lbs @ 1.900" - 1.150" Coil Bind

I am asking as I am getting a cam spec'd by Oregon (they are regrinding my old Crane hydraulic flat tappet into a solid flat tappet) and Ken recommends less spring pressure for the solid flat tappet than what I told him the valvesprings supposedly have- 120lbs closed and 300lbs opened, versus the 145lbs closed and 360lbs opened as spec'd in the listing for the Speedmaster heads. I don't physically have the heads in my hands yet, but from what I imagine, they are shimmed to get that pressure with a 1.9" installed height as listed. Has anybody ran these speed master springs with a solid flat tappet under .525" of lift or tested the pressures of these springs? Are they lower in pressure than Speedmaster advertises? I was hoping to run these heads assembled (so long as they checked out) with the parts they come loaded with, but I don't want to put unnecessary stress on the valvetrain in the process after I am finished break in with the inner spring removed.

Any experience with these is appreciated!