Turbo opinions

Deff go with the 76. 70mm is to small for a 351 and will choke it. Shouldn't need to go any bigger then that as the 76 should be about all the 351 can handle. Which 76 were you looking into exactly?
 
I suppose it just depends on the combo and the end goals. How much does a 75 cost?

Guessing you meant a 76. A quality one used can be had for around $1k, 76gtsh or similar would be nice. What is the rest of the setup? Doesn't matter to much long as its at least some bogus aftermarket h/c/i setup, the 76 will do the rest.
 
While the compressor is important, I'd be more concerned with the turbine side of things. Personally, I'd be looking into a T6 flanged turbo for >351ci. At a MINIMUM a T4 with a .96AR housing. I have both a T64e with a .81AR and a T76 with a .96 for my dart block 331 single setup. I'm undecided which I will use on the combo though. One would be a better street setup, while the other would be a better track setup.
 
While the compressor is important, I'd be more concerned with the turbine side of things. Personally, I'd be looking into a T6 flanged turbo for >351ci. At a MINIMUM a T4 with a .96AR housing. I have both a T64e with a .81AR and a T76 with a .96 for my dart block 331 single setup. I'm undecided which I will use on the combo though. One would be a better street setup, while the other would be a better track setup.

Good call should have mentioned that figured he'd just do the research. a T4 76 and a .96 housing is what I would do. Will be fun on the street and run hard at the track. As for the cam, the LS on it is 112 I believe which isn't the best. If your doing this cheaply just get a F303 good turbo cam and isn't bad in price either.
 
i was thinking the master power to4e t-76 p trim with the .96 on the turbine side and .72 on the compressor side. what differences would this make killer canary as to what u suggested?