How to get rid of understeer in a 1970 340

Stock 340 torsion bars , sway bar front , gas shocks not sure the brand ,Firm feel stage II steering power box 8 3/4 rear with HD leaf springs , no sway bar . When I'm on the gas in a big sweeping turn I get understeer , feels like the front wheels are lifting off the ground . Other than that the car stays level , does not lean over . 225-60-14 tires up front , 235 60 -14 or 15 out back depending wheels I use that day .
Any ideas ?

Thanks