that would be a step backwards. the cost of swapping in a 4.0 would be $4000+ for that money a 3.8 can have a procharger kit on it or a turbo kit on it and as for splitports 99+'s will make minimum 280rwhp 300ftlbs torque.
the the OP. nothing wrong with pushrods. the 3.8 heads are really a...