Prob not many will agree with me but if you just need low cost pretty much stock engine option.
Get a low mile 400 or 440 motor home engine. most of them can be had for under $1000 , cheaper if you look around. Its no Hp piece for sure but the one { 440} I grabbed is a nice running sound engine.
I reused parts off my 383 like the pickup tube & pan, my 383 headers , dip stick tube, water pump and housing, motor mounts ect. If you buy a cast crank engine that most MH are you will have to get the right balanced Tq. convertor if your car is a A/T.
From there you can just get it up and running or spend a few extra bucks on a intake and cam if you wish.
Everyone has a budget , some are big some are small, mine was small.
No regrets on my choice, 35K mile engine that runs good now, I had help from members on here working with the carb and cam & ignition. Its running just fine now.
My total cost was under $2,000 for everything done, up and running.
Plus you will still have your 383 if you ever wish to build it using a machine shop, new parts ect.
Just another idea or way to skin the low buck cat.