First thing I recommend is to make sure his numbers are airtight, get a few opinions (I can refer you to an amazing Realtor we work with in Indy). Did he plan for contingencies? How well do you know him? How many CMA's have you gotten? What are average days on market for the neighborhood? Where is he getting his SOW from? Does he have a contingency fund built in the numbers? How is he selling and marketing the property? Are you paying agent commissions?
Second, you want to make sure you are covered. If you are strictly a debt partner then you will need to make sure you have first position on the property and there are no other liens. Does he have any skin in the game if things go sideways? I have a joint venture agreement I can send you that we use with our money partners, it can easily be adjusted for the terms you are seeking but it will get you on the right track as far as what you should be looking for.
IF his numbers are correct, you are all it at 74%ARV and on such a small deal, that is really not a lot of room. I am currently investing in Indianapolis as well and we shoot for 65%ARV all in but we won't go higher than 70%ARV. Hard-money lenders won't lend higher than 70%ARV for a reason and they usually require at least 10% of the purchase price down. So, the deal might be okay, but you really want to make sure it's a good to great deal if you are going to be at that much risk. Say he flips it in 4 months, you stand to make 7k on 115k. That's only a 5.9% return on your money, not spectacular for the amount of risk you are taking IMO. After commissions and closing costs, holding costs, etc. you are looking at less than 20k profit before he pays you, IF nothing goes wrong AND the numbers are completely solid....It's a little risky for my taste. We pay are partners a bit more and our margins are way bigger. As the person putting together deals, I would not even think about pitching this to anyone.
Long 2-cents, sorry, but I hope it was helpful. Reach out to me if you would like me to look over the deal for you or if you want a copy of our JV agreement. Best of luck!!