@Jesus Chavez, follow the 70% rule or run away from the deal.
$410K ARV x .70 - Rehab Costs ($30x1100sq.ft) = $254K purchase price.
I'll use $30/sq.ft rehab as it's in the middle of typical costs and carrying costs around $2,500/mo. Here's my numbers...
On a $330K purchase, you'll need $378K to buy the house and sustain the rehab time.
$378K earning 7% interest will yield about $2,200 monthly. So you'll need to make at lest that much profit of a 6 month period to justify the purchase. That is if you have the $378K in cash to buy. If borrowing, then your carrying costs are likely going to be higher than what I quoted above. So...
$330K is too high and you'll lose money at $30/sq.ft. ($30x1100sq.ft=$33K). So add in closing costs of $24K and carrying costs (say 6 months $2,500/mo. = $15K).
$330K + $33K + 24K + $15K = $402K
So if you can get $410K, you might walk away with $8K for 6 months of work if it takes that long or if you have drop your price any, you'll likely lose money and waste 6 months of your time. If it takes less time, then the numbers only change by roughly $2,500 each month. With that said, your extremely close to losing money and my numbers are based on no additional problems being encountered (the hidden repairs).
$8K / 6 mo. = $1,333/mo. earned at a sale price of $410K
Maybe you can shorten the time to completion, but my numbers are closer to real numbers for the new investor and good conservative numbers for the seasoned investor.