Old thread but here's a reply... Currently I am running headers, 104 AL copper plugs, e85, 42.5 injectors, gen v blower, 3.5 mps and I am able to run 21* timing no kr with a 10.8 AFR no problem I just ordered a 3.3 MPS pulley so I can reduce timing a tad and get more boost. But I am assuming he is running a gen 3 blower so even a 3.3 mps would be safe with headers but the key here is finding you a tuner close by if you haven't and if you are still in the 3800 world if not this reply may be useful for any other thoughts or pulley and e85 vs tune.
