hate the black smoke

[ferdz]

greetings to all.

first of all my car is a 1977 300d non turbo. my concern is that the car has a terrible black smoke. the IP was already calibrated it seems nothing happen. they say that i need to replace the nozzles. my problem is i don't know what nozzles should i get.

for concern,what is the difference between 240 and 265?

what is the best nozzles should i put in this car and what pressure should i put to it??