Stop in for a cup of coffee

Well, I've drilled the old floor on the Belve, and mounted the seats on the riser brackets, and installed the driver seat. But.....even with the adjuster all the way back, it is TOO close to the steering wheel...Back to the drawing board. Guess I'll be moving the holes 6-8 inches back, But the problem is, the floor starts to drop off , not far behind where the rear holes are drilled.....:BangHead::BangHead::BangHead::BangHead:
Any help here? Any super stock seat bracket experts here?