To Sell or to BRRRR?

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I am about to close on my first fix and flip deal, a 2 bedroom 1 bath, single-family house. I am purchasing it for $50,000 with hard money, and plan to spend about $20,000 to $25,000 to rehab the place. The appraisal for the hard money lender came back at $135,000 ARV. If the house actually appraises for that amount, or even close to that when I'm done with the rehab, would it make more sense to sell the house, pay taxes on the gains, and reinvest that money into another deal, or would it be better to BRRRR the property? Rents in the area are around $750, and I would refinance the mortgage for what I owe to the hard money lender, roughly $65,000. Say the PITI is somewhere around $450, leaving about $300 before other expenses. Are these numbers reasonable? Would I be able to take out a HELOC for about $70,000 to turn around and reinvest? This is my first time going through this and just want to make sure I'm weighing my options. Any advice would be greatly appreciated.