1968 912 porsche?
 

My customers have a 1968 912 porsche the handling is great with the new supention on it what are the best upgrades my customers could get to make it get up to or over 300hp my customers motor now is is about 140 with the minor stuff on it mostly just the carbs what X-431 V

could my customers add tuurbo,cold air intake,or new ecu is any of that possable?