I would shy away from ordering a BC stroker... I have heard horror stories...
That and I have held the OEM, BC and Mine all side by side. The OEM and Mine were much better quality.
Mine is a private label crank for GTM but here is the manufacturer:
Billet Crankshafts | Crankshaft Repair - We Fix Crankshafts - Marine Crankshaft, Inc. - Outboard Crankshaft Repair
Being as I have span the gamut of power levels for this platform... I have had my hands on a 600whp car all the way up to my current 1000whp car soon to be alot more. I will give you some sound advice that will spare your wallet.
The 3.7L is more than capable of making 1000whp. I would get a closed deck block go with a stage 2 Fast intentions kit with all the options. I would look to CJM for your fuel needs or if your a ways out Fore innovations may have a solution for us at a GOOD price. Each manufacturer of their turbo kits has an ideal setup and after talking with multiple manufacturers my money is on Tony and Team @ FI. Their kit has the best design to date for mid mount twins and is more than enough to get you to any power goal you want. ohhh and as far as clutches go stick to OS giken double for anything under a 1000whp you wont regret it.
Remember speed costs money... how fast can you afford to go?
My first round cost me greatly! my second round is going to cost me nearly $20k just switching kits and gettign upgrades for parts I expected to break.