727 limitations

Currently building a 493 stroked 440 and estimate will put out between 650-750bhp.

I'm running a complete standard 727 currently with a csr shield. Will have a fti torque converter with 3800 stall rate with 440 source sfi flex plate. Car will be street strip use.

I'm wounding what power a 727 can handle. Guessing will need modifying to handle power and if so what parts will needed. Want to keep an auto option valve bodie thow so can keep auto function for street us. Can you get a manual/auto reverse valve bodie?

Many thanks