Stiffer front shock?

So now that the Dart has the XHD rear springs in and I raised the front T bars very little for an even look,me happy but,sometimes going over some small bumps in the road and if there is a crown in the road the front bounces up and down not much but enough that my low hang en headers hit,wished I took the advice from some of youssssssssss to get the TTI headers.So in short is there a stiffer front shock for my 69 Dart with the 360 in her,bty the front shocks don't leak and are old never did changed them when rebuilding the front end.