need help on build 440

It all depends on the kind of HP you really want to make.
What motor is in the car now and is the 727 a big block trans?
The 71 440 would be fine to more HP then you would want, but there are alot of more mods to do with putting in a big bolck in an A body.
If money is tight and the car has small block 8, just build that. You can build a nice 400 hp that would be cheaper in the long run and still alot of fun.

Keep the 440 and build it slow over the next few years, after the car is back on the road. Because after you feel alittle power for the small block, you'll always want more.
I am putting a 440 in my barracuda and I am going to have about 5-4k in the motor alone. I will cost me another $300 for the mods to just hold the engine in the car, plus the are alot more cost for a new trans, headers, better rearend, engine cooling and more. I know I heard alot about who cheap and easly the swap would be, but if you don't want to start breaking other things and want to redo it. It best to do it right the first time, even if it takes alittle longer then you would expect and cost alot more. I think when I get done, I'll really like the BB, but a sb would have been cheaper and the car would be back on the road by now.
Good luck, and used parts always helps make the build cheaper.