New Generation Slant six enthusiasts

Like most Mopar engines, They did everything well. The best thing to do is cam them, double roller timing chain, mill the head, and cc the chambers, OEM factory 2 barrel carb and intake, electronic distributor, 2 1/4 exhaust. They will beat most anything near their size and live forever. 170 for high RPM and 198 or 225 for torque. What more do you want? As for aftermarket, you have to support them, lesser engines need constant upkeep and replacing, so there is a ready supply of parts for them.