8V71 turbo specs

[luvrbus]

Yep I would rather have a 400 hp producing 1600 ft lbs of torque than a 500 hp producing 1400 lbs with the long almost flat torque curve any day   

[daddyoften]

Hello,
It's been awhile since I've been on here but it looks like I'll have some time to start working on my project.  I have a 4107 with a transplanted 8v71TA from, what I've been told, a 77 transit.  It's mated up to the 3 speed auto, not sure of the model number again.  I've been told it is a rebuild and only has about 10k miles on the engine and tranny.  I got the bus in the early stages of the build from the PO but he passed away.  I was reading this thread the other day and looked at the injectors in my engine.  Looks like they are C60's  I'm pretty sure the engine is setup originally stock with the turbo.  I didn't find the Aftercooler water line but I may not have been looking in the correct place.  I was doing a bit of research and I couldn't find much about a turbo with C60's but it looks like the C60's aren't that common.  I am looking for good performance but without sacrificing economy.  I know I can't always have the best of both worlds.  I think I'm leaning on economy more.  But I also know that if you under power a vehicle then you will suffer economy, performance, and longevity.  The PO also installed a vac/boost gauge right before the blower intake.  I haven't been able to drive it much but sitting still and I rev it up I will get a vacuum on the gauge.  I drove it up to the Port of entry on the 4th to weigh it and I never saw a boost on the gauge but I can hear the turbo back there and I can sure hear it spin down when I shut the engine off.   So, on with the questions.....
Is the C60's ok with a turbo engine?  Does it sound like they are stock.  I understand the C's are California low emissions version.  The engine does not smoke at all! just a small puff on startup and then clean as a whistle.  Is this the setup recommended with the tranny I have?  I am now running the 12 22.5 tires but I'm going to run 11 24.5's as they are about the same size, easier and cheaper to find, and the local tire shop has some used 24.5 bud aluminum rins laying around and I know them well enough they will give me the rims for buying tires from them.  Anything you would suggest I change or look at? 
Thanks,
Eric.

[Geoff]

The C60's were the standard injector for turbo 8V71, but before you think of going bigger, look at your block and see if the air box covers are small rectangular covers or the big oval stamped steel covers.

If you have the big oval covers, just hold your breath.  You have a "dry block" and they will crack on the lower bore.  Otherwise, N75'S will work.

--Geoff