Disappointing ET's with 408

The 60 foot is OK for a high to mid 13s. I run low 11s with untouched heads and a solid cam sim to yours but i run more comp. Do a comp ck let me know psi. I run the tti headers not a problem.I wouldnt change headers unless you go to a w2 head just my 2 cents on headers. Def 850 on carb and 3 in min on exhaust get that straighten out ,test post times well talk conv later.