By the looks of the picture they're the Econo head with the built in rocker stands. The race heads have the shaved stands that you have put the aluminum rocker stands with the offset W2 shafts on. I believe you are correct at 72cc.
I agree. Looks like the same heads/ rocker gear I am running on my car. I have the same intake but just recently swapped it out for an Edelbrock Victor unit. The heads work great.
Someone should buy this top half. Good luck with sale!
