I did a search of the forum before I posted and found lots of discussion on removing the rails and bolting directly to car, but I also saw one particular post that made reference to "big man" seats in an SPF, or something like that. It's an older post. It made definite reference to the seat, and not the seat mounting.
I'm headed over to Olthoff's Racing this Friday and I'll ask them about it. I'm 6'3" and didn't have trouble with legroom in the one SPF I've been in so far. At 220lb I'm not THAT heavy, but my hindquarters are apparently dimensionally challenged for the SPF seat.
