I have one of the Ford Performance (Ford Racing) aluminum block, CNC aluminum heads, 427 cubic inch 4"stroke and 4.125" bore Windsor architecture long blocks. The internals include Scat steel crank and forged steel H beam rods, Mahle pistons, Comp Cams roller cam, aluminum roller rockers, Jomar stud girdle, etc. They list at US$15,995.00 but can be purchased for about $14,000 from some suppliers such as Auto Nation or Tasca. I have not run mine yet but will be ready to soon. It was broken in on the dyno at 589HP before shipping, with a single 4 bbl carb and should make about 625HP with my 8 stack injection system. They can be ordered with either front or rear sump pan. I replaced the pan with a Dan Olson aluminum road racing pan. When I bought it about 3 yrs ago it was about $11,000 delivered. In my opinion they are a bargain, and are very good value compared to buying all the parts separately.
A link follows below:
https://performanceparts.ford.com/part/M-6007-Z427AFT
Best regards,
Gord Zonailo