DMD bolt is TTY too.
You only need JBweld if you're using your SVT heads, but you said your getting a longblock which implies your using the 3L heads.
Get new timing chains. Worth the assurance.
Custom chip will cost you about $400, and you don't NEED a Apexi, but it will help complement the chip is what I've gathered from other's posts.
Consider headers or gutting your precats at the same time since it will be easy to do with them off the car.
