Yep they were the hipo 2783's solid lifters, different intake with the modified single/dual plain method, larger journals and bearings but same as that in street cars. Really good motors. Because of the head design of 273's Chrysler felt they would do better with the 340 type head - X or J, do not remember which -. destroked with factory stuff. Great motors, had friend in Alaska who had a real racing T/A Challenger, what a car to drive/ Sure was more than the advertised 275hp, mnore like 400 plus.
