63 R code 427 values

[Black430SCJ]

I have a std bore 63 R code 427 low riser dual quad engine I am considering selling. Engine is complete pan to carbs and all pieces appear to be date code correct. 1 cylinder has some crud that will need to be cleaned up when rebuilding. Worst case scenario would be 1 sleeve. 1 exhaust manifold has been butchered for fitment in an early T Bird. Any idea on value?
Thanks