If you want to keep daily driveability, go with the 331. The 347 is more for hardcore racing and has some bad long term piston ring problems. DSS Racing makes an excellent Bullet short block. I would also go with a 180* thermostat.
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1989 Black Mustang GT Hatchback, Underdrive Pulles, Electric Fan, Cold Air Intake, Headers, Offroad H-Pipe, Magnaflow catback, Steeda Tri-Ax, Fluidyne Aluminum Radiator, Timing at 14*, 3.73's
Coming not so soon: 408w
Ricer Hater's Club Member #59
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