The small thumpr cam works well in carb engines but not sure if its going to be happy in a efi car. But comp does sell a cam for efi vortec that will make some good power.
You can use some cams in the efi vortecs but make sure it can be tuned to support the cam. Its almost certainly not going to be happy with a thumpr but i have seen them in a gto it had a few issues but was drivable as long as it was warmed up.
Thumpr Will be just fine if going to carbed setup.