What OBD1 horsepower mods?

depends on how much you want to spend. hughes offers a bigger throttle body, intake , injectors, cams, etc. I would contact http://bgperformance.com/. they can program your obd1 ecm and might also be able to tell you what the stock ecm can handle. theres a lot of guys on the Dakota/ram forums that have made engine modifications with the stock ecm.