Purple Shaft or NOT?

Happy New Year to everyone. I am new here but have been lurking for a while. I am in the process of building a 408 stroker motor for my 74 Dart Sport. I purchased the kit and cam from Indy Cylinder Heads. I am looking for a street machine with lots of torque. I have concerns about the cam that Indy sold me for my combo any suggestion prior to me installing it are appreciated.

My combo:

1974 Dart Sport - Power Brakes
4-Speed
3:55
26" tires
Eagle 4" crank
Eagle I beam rods
Wiesco -20cc pistons (4.030) (Indy said 9.5-1 CR???????)
2.02/1.60 mildly ported J heads 71 cc (plan on running stamped arms)
Edelbroch RPM Air Gap manifold
Carb?????
TTI headers & 2.5" h exhaust
284/284 484/484 Purple shaft 108 center 68 overlap (241/241 @ .050)???? I have been told to install it at 104???
MSD Distributer and 6al ignition

The block is going to the machine shop on Monday and I hope to start assembly late next week.

Again, I am looking for a street machine that leaves the stoplights strong, and has a lopey idle. Thanks for any advice on the cam, and anything else that might help this build.

Jim at Indy Cyl Heads said that cam was an 1800-6800 rpm cam, doesn't match with my research. Thanks for any info you can give me.

Sportman