@blueriver
my 2 cents: It depends on your situation. Are you going to fly B3's only afterwards? Are you paying yourself for the typerating?
In general the B3 is just a piece of cake coming from a B/BA/B2. Startup by simply turning a (ok, two) switches. No 'real' governor failures to train and usually no need to think about power available.
However, if it was my pocket, i'd to the TR on a BA (i did actually) and differences training for the B3 afterwards (45-60 min of flight ... typically like a checkflight). The typerating itself actually is AS350/350B3/130B4 with only differences training between them.
It depends on the owner anyway whether he gives you his helicopter with less than 20ish hours supervision on type.
Whatever you do: Have fun (you definately will)
