I am using a SFT in my personal DD because I used Pcar heads and didn't want to deal with installed height/geometry issues.

That said, there is no way I would ever do a SFT on what you are doing. Never. Ever. The only reason to not do a roller is cost, or if you are trying to use stock heads and the installed height is so damn short. With your heads you should NET at the minimum .700 lift. Thumper is running a bit less than that but I would shoot for more lift.

Roller hands down. Unless you are a cheep screw. Or, you are using production heads.