a buddy of mine has a 347 and has the tfs heads and with a port job got 375cfm int. and 325 ex. (the porter wants them back to mount on his wall there the best heads he has ever done) And ther not the new tfs heads there the old 5-7 years old the first ones with out the high ex port. no b.s. If its all out power than id say tfs or afr, if its daily driven with some racing get the gt40s or jr. they have way better com.chambers over stock.
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mods on car- 3.73, msd digital6, compucar wet kit, pullies, k&n,mac shifter.
Mods not yet on- iron gt-40s, trick flow cam
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