Crossover Tube and Valve Spring Pressure Questions

Right now I am putting together a pretty hot street 318 as the one in the car now has started huffing a considerable amount of oil out the exhaust and the breathers.

The combination is going to be:

1969 318
Cast Crank 10-10 (ARP Main Bolts)
340 rods (shot peened, corners rounded, ARP bolts)
Mahle Full Groove Bearings (Main, Rod, And Cam)
D.S.S. FX-Series Forged Pistons 3.950 bore -3cc flat top
Guitarjones oiling modifications
Isky 292/292 @50 244 .505/.505 108LSA Hydraulic Flat Tappet
Speedmaster 170cc 65cc Chamber Aluminum Heads
Torker 340 Intake (might try and find a Airgap)
770 Street Avenger

My Questions are:

Can I run the hydraulic (current cam in old motor now) with the crossover tube and blocked off drivers side oil gallery? Or will it not get enough oil over to the drivers side to oil properly?

What is a safe range for seat pressure on a Hydraulic Flat Tappet? Currently I have 328lbs of open seat pressure and it seems I start to lose valve control at 6100-6200. Ideally I would like to try and get to 7000+.

Thank you