turbo 360

lbs/minute is quite a bit different than PSI (pounds per square inch)....so no, I do not mean it will push 70 psi.

The most boost I have ever seen go through an engine was 45 psi and the engine that consumed that didn't last but a few pulls before the headgasket yielded....it was a Mitsubishi 2.0L cast iron 4 cyl. block, aluminum head with steel o-rings, 4 ARP head studs per cyl., copper head gasket...and couldn't stand that power level.

I think where my friend Wes messed up with that engine was he was running 91 octane/C16 (116 octane) cut about 50/50. I think the fuel didn't have the detonation resistance that pure C16 would have had....but understand that $13/gal fuel is expensive to tune on. O-well, lessons learned.

You might just go ahead and spec out a compressor if your gonna go with a 408....the Mp T70 is good for V8's 360ci and less. For your desired engine size/power level, I would go with a custom spec'd compressor from http://www.precisionturbo.net/ from the get-go.

Something inbetween 70mm and 88mm should suffice nicely....and let me put this out there....depending on "where" in your rpm band you want the surge of boost to hit....size the exhaust trim. The smaller the "choke", the sooner the boost hit, the larger, the later.
A .85 would theoretically hit 2500-3500, A .96 would hit 3000-3500-4000, a 1.06 would hit 3500-4500.