I'd go with a 3200 rpm lock-up converter. 2800 works with a near stock to fairly modified Mustang, but with your heads and intake, I'd bet your powerband is coming on more in the upper rpm's starting close to 3000. However, alot is going to depend on the cam profile you chose. Decide the cam first, figure out where you're making power, and go from there.
--nathan
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'91 GT, Coast 347, 9.5:1 compression, full intake, Wolverine 1087 cam, exhaust, Keith Craft ported Windsor Jr. Irons (235 cfm intake, 195 cfm exhaust), AOD, PI 3500 converter, Lentech valve body, 3.73's (4.10's in the works), and Yokohama ES100's out back.
Daily Car: '04 Infiniti G35 Sedan 6MT
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