Stock flexplate, converter and driveshaft hp + tq limit?

Hey guys,

ive got an got an aluminium headed 408cui in my 74 Scamp, about 10 to 1 compression, comp XE275 cam, air gap, holley 750 dp, msd ignition... nothing too crazy.
Last year my second hughes 2500stall converter failed and ive thrown in the stock converter with the stock flexplate, which came in the car when i bought it with a 318cui.
Car drives great since then with no issues and actually i really like the stock converter.
Trans is a built 904 with reverse manual vb, rear is a 8 3/4, clutch style sure grip 3.23
Now i have a set of mickey thompson street ss 235/60r15 drag radials and another 3rd member with an eaton true track and 3.91 in the basement which i would like to install this summer. I already istalled a driveshaft safety loop just to be sure, but should i worry about the stock flexplate and converter with the drag radials?? Car is driven on the street.

What would you guys say whats the hp and torque limit of a stock flexplate, converter and driveshaft?

Thanks for the help, Laurin