Just remember they don’t think in terms of small block Chryslers and the jacked up lifter bank angles.
At your spring pressure I’d be running no less than a .120 wall single 7/17-3/8 tapered pushrod.
They aren’t cheap but the SBM is harder on pushrods than about any other engine I know of.
Smith Brothers will probably disagree with me but they are wrong.
And it’s not just Smith Brothers either. It’s Trend too.