I am running a P600B w/ 3 core on a fuel injected 351W and love it, I was going to get a D1SC but found a used blower for a 1/4 of the price for the D1SC and sheet metal intercooler.
I would go with the D1SC I am running 12lb pulley on my 600b and am only seeing 6 to 7 psi, I going to try my other pulleys 14/17lb and see how much I can get out of it. If I can get 12-14lb out of the P600B I'll be happy.
If I ever decide to stroke my 351 I will have to step up to the D-series, because I may be at the limit with the P600B.
Good luck with what ever you decide.
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