i need help w/duster engine

You sure your a girl?.....will you marry me? :grommit:
its got an 8" 5k from Kenny Ford in ala.
I have a 4.30 in it now...with the 29" tire.
but i have 4.56 if i need it..?

the heads flow to .600" or lets say..they didnt drop off till after that..on
the flow sheet...my uncle ported them..they are ta/X cast iron heads..

mel.