Six cylinder torsion bars with big block

Ok this thread has me worried now did Mopar make a very sub standard front suspension that made all their cars a danger to drive? If so why were they allowed to be put on the road ! Let's look at this from a numbers poimt and I want real advice not you home grown bull **** opinion!

6 cyl bars are .830 diam / 100lb/inch rate

340 bars are .870 diam/ 120lb/inch rate

383 bars are .890 diam/ 130/inch rate

Now my bigblock is 500 lbs 25 more than the advertised weight of the 6 cyl! I am also. Running a glass pun on hood another 30 lb saving! I see no reason to run anything more than the 340 torsion bars on this car!! Any serious input and reasoning would be appreciated! This car will be street driven as if it was 1971!