Local Shops:

Batlground aka Batlground.com or email [email protected]
Vuongs Garage -770-374-9449
Mainstream Performance 678-567-9384 aka mainstreamperformance.com

ILOVEBOOSTs motor was NOT built by mainstream, it was built by GOLDEN EAGLE in california.

However Mainstream did the turbo kit and tuning,top end assembly and the car made TONS of power. IIRC it still runs to this day over 40k miles later, not bad for a 630whp LS

Not trying to start anything daniel, just saying that GOLDEN EAGLE shipped that shortblock already assembled.

Which leads me to the next choice:

Golden Eagle Manufacturing can ship you a sleeved and assembled block for around $3200 with rods, pistons, sleeves, bearings , machine work already included. youll need to purchase the timing belt, oil pump, oil pan, etc seperately, but its a built motor backed with somewhat of a warranty.

It will all come down to preference. Call everyone, email everyone, ask around GA, and you will come to the answer you want.

All 4 places i listed you can trust.