Wondering you guys opinion on this. have around 550 hp&tq on my 70 chevelle. how much body bending if any would i have to do. and will this tranny handle it?

sry, clicked this instead of troubleshooting

call phonix trans in weatherford tx 817-596-0011 they built my 700r4 for my 575hp bb chevy and gave me a 24000 mile warr i lov mine it made all the dif in the world