Stroker 340>416 Build Advice

Ok so sounds like hydraulic is the way to go. Ill try to call Bullet and get some info from them. I imagine that their prices are more since its more custom? Beyond that whats the benefits of flat tappet vs rollers?
Roller tappets are pushing 800-1000 bucks. And may need block machining for clear. Good flats are 200-500 for a set. And a custom ground cam from Howard’s was like 10 bucks more than a shaft cam.