While I am not a dyno expert (and I don't play one on TV), I look at it this way: the RWHP numbers are lower than the flywheel numbers because of losses thru the transmission; by the same token, the RW torque numbers are *higher* than the flywheel numbers, because of the mechanical advantage of the transmission.
If I use a 5' cheater bar to break the axle nuts loose on my VW, I'm exerting (let's say) 350 ft/lbs of force (ie RWft/lb), but that isn't the same as eing able to
bench 350 (FWft/lb).
So, if the common drivetrain loss factor is given as 15% (I've seen up to 20% quoted) to convert RWHP to FWHP, then likewise, you'd need to apply a similar *gain* factor to torque.
Example (for illustration only!) assuming 15% each way:
RWHP * 1.15 = FWHP
236 * 1.15 = 271.4
RWft/lb * .85 = FWft/lb
412 * .84 = 350
Those numbers are somewhat in line with the table for the RS at
http://www.paulweir.com/rebuild/911engine.html