I drag race a 2.5 motor that was switched from efi to the carb set up. This ia a 87 tall block that uses the roller cam. When you switch out cams you will also need to change the entire valve train too. The roller followers will be needed in addition to the different valves and springs. Since you have a turbo motor you need to make sure you have the turbo exhaust valves to prevent valve damage due to excessive heat.
If you have the slider cam head on a bench you can't hardley turn the cam gear, but the newer roller cam head you can. I think the rollers are also only a 410 lift while the others are a 460. If you shift at anything above a lowly 4600 rpm you are beating a dead horse, while the slider cam lets you rev the heck out of it.
On my car I went from a 2.2 with a Lambros racing 500 lift hydralic (495 actual) to the 410 lift roller and a 2.5 ltr. My 0-60' times improved, my 0-330' times improved, and my 1/8th mile times improved....but at that point the mph was even...the 1000' time was slower as was the 1/4 mile time and speed. I shift into high right at the 1/8th mile mark. The 2.2 efi cars and 2.5s were rated at the same hp but the bigger motor had quite a bit more torque. The extra cubes did not gain more hp due to the smaller lift cam.
Since you have one of our cars you can join the Shelby/Dodge auto club. There are several clubs around and forums too. For links to hot rod shops, forums, and clubs go to:
Shelby Dodge Auto Club you do not need to have a Shelby. In the forums you can also find good info on all sorts of things even how to convert to E85. My user name there is Matchbox