If you are really worried about durability, use a hydraulic roller grind with solid roller lifters. Lash it cold .002 if you have an iron block and aluminum heads, maybe .001 if you are careful. It will out power the SFT and HRT and will be stone reliable. Been doing it for years, even though most say don't do it.

I don't remember but aren't you using aftermarket heads? If so there is no way I would screw around with a SFT.

Don't step over donuts to pick up dog turds.