Mopar R3 Block
I finished up my R1, Indy headed 434 build six years ago. I bought the engine complete but apart, 396" IIRC. I sold the 3.79" rotating assembly and bought a 4.125" crank and rods and had Diamond build a custom piston for it. The heads were freshened and ported along with the intake, new roller cam and valve train. The engine, parts and machine work all totaled over $17k and I did all the assembly.
If I were doing it again, I'd buy a 6.4, change the rotating assembly, add a hair dryer and go run low 9's on the weekend and drive it to work during the week. Well, now I'd drive it to breakfast and lunch everyday. LOL