Replaced my Dart

I have a numbers matching 1970 Swinger 340/727 with factory A/C. I found the build sheet, all legible, undre the back seat. I rebuilt the ALL original motor, but wrapped it in plastic and put it in the corner. I'm building a TF head 408 for her, because I want to run her hard once in a while, including the occasional 1/8th mile at the local strip in the summer. I'm keeping all the body stock, and not doing anything that can't be undone to restore it and run it across the block at Mecum. I'm not being an a**, but I'd like your opinion on my plan if you were in my shoes. Restore and baby it, or go my route with a "disposable" engine and have some fun on the streets? I respect your opinion, I'm 63 and questioning my plan. All polite opinions are invited. Paul.
I totally agree, I think someone else here races their Formula S with their original motor tucked safely away while they hammer away racing on another motor. A friend of mine from from years past still has his original 70 cuda 440 six pack that he pulled the motor in the 90's and had a beater motor built for hammering on. When it was brand new we would race each other and others on the street for fun. The 727 was rebuilt by the Chrysler Dealer in NJ twice in '70 and '71 until they no longer tolerated his abuse lol.