well, the Talon couldn't run a hemi because there's no FWD transmissions that bolt to it and drivetrain conversions aren't allowed in SM. Also, it's not like it would want to. That's too much weight and torque for that chassis.
Anyway, if built properly the Z could still be a competetive Mod class car and most regions don't get a lot of competitors in that class so if you enjoy bringing home a local trophy almost every weekend, you could have a lot of fun with it.