6-8 psi boost is pretty low... it was the boost used on the production Buick turbo'd V-6's in the mid 80's. I would go for it; the better mileage rational makes sense to me. The comments for the CR are good, IMHO.
And there you have it.... I had my hands the V6 Turbo Buick stuff in the 90's...... Your Boost level of less than 10lbs won't even scratch the surface of the power potential. Even at 365 inches it would be a beast.... Cool the air charge properly and with good tuning you will be riding. I like the idea of a Block Girdle, Head Studs, and really good head gaskets.... I could go on and on but would be boring banter Lol....