Plaid has 1020hp, weighs 4800lbs and runs 9.25I could be wrong but I think it would take more than that.
That 170hp wont have the same return on performance like the 140hp difference did between a regular HC vs the Demon.
1010HP Demon at 4000lbs (Speed Core CF panel(s), CF wheels, etc.) running 8.99 on a prepped track with good DA definitely should be possible...
Perhaps our resident stock Demon expert @dragrcr can chime in with his thoughts here...