Match Race ~ 1970 'Duster 340' vs. 1969 Mustang 'Mach 1' 351W

Why am I thinking .429/.444? Replacement cam specs?

1970 {340/275 HP} Camshaft Specifications {As per the Factory blueprint}
Lift ....................... .430"/.445"
Duration ................ 268*/276*
Duration @ .050" .... 210*/221*
LSA ....................... 114*
Centerline............... 112*

Replacement {340/275} Camshaft {P/N #4452782}
Lift........................ .429"/.444"
Duration................. 268*/276*
Duration @ .050"..... 228*/235*
LSA........................ 114*
Centerline............... 112*

Replacement {340/275 HP} Camshaft {P/N #2899206}
Lift....................... .430"/.444"
Duration................ 268*/276*
Duration @ .050" ... 210*/220*
LSA....................... 114*
Centerline.............. 112*