I installed the spal, it's a 30 amp, dual puller 11", 2700cfm
http://www.spalusa.com/store/main.aspx?p=itemdetail&item=30102052

I bought a chrome alternator rated at 100 amp with my march performance serp system, but actually produced just 59 when shipped.. so I had it rebuilt to 100 amp

I have to replace the relays tomorrow too, I'll let you know the (short term) results then