you want a minimum of 318 A/C-340 bars and can step up to 383 bars. Lots of guys like the truck ride of the bigger bars, your choice.
Per grimreapers old post:
DIA Rate Part Number fits
0.81 90#/in P5249148 drag bars
0.83 100#/in 2535888-9 slant six bars
0.85 110#/in 2535890-1 slant six w/air - 318 w/o air
0.87 120#/in P5249149 (2535892-3) 318 w/ air - 340 std bars
0.89 130#/in P5249150 383 std bars
0.92 150#/in p5249151 *h/d handling
0.99 200#/in p5249152 solo/road race
1.04 250#/in p5249153 h/d solo road race-oval track
1.09 300#/in *p5249154 oval track 1/4 mi--optional 1/2 mi
1.14 300#/in5249155 oval track 1/4 and 1/2 mile *
