I honestly think the T70 would be more fun.. The T-76 can take you alot higher than you could ever go with a roller block anyhow...
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?
What I am saying is that a 76 will better suit it. A 70 i suppose could get into the danger areas of a 351 but why string it out?
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.
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