You will get more miles out of the 331 but the 347 will build a little more power.
I have the 347 and mine is daily driven.
__________________
James Cox
RHC Member #44
nochevy@hotmail.com
1991 Mustang LX
Dart iron eagle block, 4340 28oz 347 crank, 4340 h-beam rods, probe ultra light pistons canfield heads “race ported by Brent Frazier”, solid roller cam and lifters “custom grind”, kooks 1 7/8" race headers, and much more.
Engine built by Brent Frazier.
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