need help financing rehab deal!

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Ok I just put a house under contract for 30K and ARV is about 80K with repairs running around 20K. I may try and assign to another investor for 3 or 4K but i would really like to rehab this one and make some huge profits as i work in the construction field and can do alot of the work myself. My problem is after a divorce and some medical bills my credit has taken a big hit arond the 540 mark (ouch) is there a way i can get a bank or any other place to finance this deal for me so i can get my credit situation straight and not have to worry so much next time? Any info would help, thanks

Brad