Seats don't differ by engine type, only by model year.
I'm 5'10" and under 200 lbs and I running Sparco Torinos and am very comfortable in them, because of their large bolstering. I'm not sure how you're sitting (is thtre more than one way???) or what makes you uncomfortable, but I think you'd miss the extra support from the pre-98 Tour seats, especially when cornering.
