Help me sort out a 10 second build

If it were me I'd port the heads and manifold. I'd build the short block with the parts and cam he has.
I'd upgrade the convertor to 4800-5200. convertor company could get you very close using your existing cam.
Chassis upgrades would be required at that point after installing motor and trans.
Just about everything has been covered for the chassis upgrades by Justin and John. listen to them.
The difference between and 10 sec blast and 12 is in the chassis.
The reason I say use the cam is you have it. you won't know what the car will do until you sort the chassis.
Cams are very easy to change.