Find the old Mopar Action article that was written about the race trans am cars with help of Bob Tarozzi who was team manager. There were a few article in magazines back in the day too. Here's one that was in Hot Rod:
https://www.hotrod.com/features/blacks-mini-mopar-magic-april-1971-982-818-42-1/ it mentioned in this thread earlier.
The SA Design Publishing book, Mopar Performance talks some about the 305's. It says 2.96" cranks were 4340 billet. I would imagine that would be Moldex or Callies.
The blocks were T/A blocks with the wider main cap width to accept a 4 bolt main cap.
The T/A race heads are different that production heads. They had square-ish exhaust ports.
You would not copy the rotating assembly today. The rod, piston, even crank technology is far superior today. And taking advantage of it will get your more HP and reliability. Not taking advantage of it is naïve and ignorant.