i bought a '73 240z somewheres in between a month, and two months ago. since that day, i've learned a few things about the flat top carbs that everybody says i should ditch. hmmm... like the fact that they totally suck! here in good ol' utah, we've got a junkyard dedicated to the classic z. the man, who lives among the z knows them inside out, upside down, front to back, and every other way there is, i'm sure. well, now that the intro crap is through, it's time for the question. he says he can modify the carbs to run better, to not die when the weather's hot. my problem is that it would cost $400! another option is to install a holley 4-barrel (i'm leaning toward this). he has all the things i'd need to convert, and he'll even do the work. it would probably cost less than the other, and i imagine the power increase would be greater than the other option. i'm just a newbie to z's though, and i'll leave it up to you seasoned enthusiasts to tell me what's up!