I'm running the Promax plates in my outboards. I think my '70 carbs uses a 34 & a 35 plate and I couldn't find one of them (one is common, the other isn't) & my plates had been drilled. I was trying to get back to "factory settings". After extensive research, I put in jets that matched the stock metering plate holes AND changed out the secondary idle feed restrictions. I had to call Promax to get the idle feel restrictors (not on their website) and they had some the correct size (pretty cheap, but I did have to put a propane torch on one to get it out)