Engine Choices: What interests you the most?

I voted 440,but take a 400 block and stuff a 4.300 crank in it.Should get 517 cubes at 0.030 over.All aluminum top end,water pump and housing should get to cast small block weight.Pistons for that motor with a 7 inch rod weigh in at 634 grams.You can get 1.35 HP per cubic inch pretty easy and will have right around 700 HP in a reliable pump gas combo with less headache than trying to plumb your own turbo set up for a small block.
If you do decide to go with a small block try to find an old 318 "X" block.They can go to a 4.125 bore and are much stronger than a factory block.4.125 bore with a 4.00 crank will get you 427 cubes and a 4.125 bore and a 4.125 crank will get you 441 cubes.And all from a small block.