how do i know if chevy sb heads will work with todays fuel?

[carpenter]

i have 4 sets of chevy sb heads need to know which heads to ues on new motor build need motor for 1 ton truck

 

[johnhurd11470]

well you know late modle blocks are different from early models so what years is you block if after 88 will need ti use newer heads with valve cover bolts in middle of valvecover