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 A rebuilt C4 with a  good shift kit, trans cooler and a looser coverter will do you fine. You can get a C4 like this from most of the mail order houses for about 700.00. For 1800.00 you get a full manual reverse valve body, trans brake, better drum, etc... That trans is good for around 800 h.p. 
				__________________1988 Mustang GT
 stock bottom 302, C4
 10.9 @ 128 with 8 psi of Novi 1000 boost!----STOLEN
 
 1989 Mustang notchback
 Warmed up 306 with a Procharger.
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