Your motor length will depend on the setback of the bracket. It's an open ended question with too many variables.
For a baseline I'll give you specs of someone I know's rebuild. He had a 25" shaft motor, installed a hermco bracket and needed a 30" shaft motor to keep from blowing out when turning. There is a rule of thumb that for every foot the motor moves back you need to drop the motor.
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1974 Seacraft 20' SF with 1985 Evinrude 150 VRO
1987 Seacraft 23' Scepter with 2007 250 HP Evinrude Etec
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