Bucket seats normally sit higher than OEM, unless you get custom mounts or bolt direct to the floor pan.
I'd have said that adjusting your position is the way to go. The 350 seats do go pretty low, and can enable an excellent (and correct) poisition. You say they're not comfy, that could be due to a poor position you've got them set to. If you change it and accept it may feel odd for a while, you could be much better off long term.
Drop the seat as low as possible, get your legs so that you can fully depress the clutch without locking your leg, then adjust the backrest so that when your arms are stretched, your wrists rest on the steering wheel. That should be perfect, albeit it does feel odd at first!
Of course, I may be teaching you to suck eggs and you've done this, in which case it's custom mounts for you sir