longhorn,im in your boat(dont push me out!)my 402 has 89.99 Flowtechs,never a leak,ive even uncorked them and used old gasket,no problems they were some Mr Gasket cheap ones,maybe a flange is bad?Tighten down evenly not cranking one down?Ive heard many bad things about sbc and headers,i personally would run the vette manifolds,but in a bbc requires headers
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