w a 455 youre likely to have hot issues....radiator in these are smaller than the cars that had 455s...it CAN be remedied, but my friends who have them , have lots of issues...300 should be fine...
Yea it could be problematic. I'm considering a resto mod with a LS i'm not sure. The car is done with the exception of the drivetrain. What would be a estimate of the cars value after a LS swap not wanting to sell it anytime soon might keep it forever, it would just be a great base for a car would be reliable and i would get more power with a base motor.