X block, 4" stroke 360-1 Indy head build questions

The blo knshould be bored o my to clean up the bore. The amount of extra cubes is minor and not worth it. The 4.25 stroke crank is nice, but since you already have a 4 inch arm, either use it or sell it and roll the money over into the 4.25.

IMO, use the roller cam even with a big roller, you'll not need to spin the mill high. The long stroke will make peak power sooner and I'd bet well below 7K RPM.