I have an AMT Hardballer Long Slide (don't believe all that you've read or heard) and it's 7 inches in length, and the frame is exactly the same as every other 1911.
You will need a long recoil spring plug. I run a Wilson Combat 18-pound spring.
Attention Brass rats and other reloaders: I really need .327 Federal Magnum brass, no lot size too small. Tell me what caliber you need and I'll see what I have to swap. PM me and we'll discuss.