I'm no expert by any means but I searched based on your door tag picture and found this about the original engine at
Conceptcarz ... "from concept to production"
Edit by Peggy M 9/27. This is a cool site and the specs they have seem really helpful.
I snagged a screenshot of their 1954 Chevy to add to your post, just because it looks great. (There is a neat VW right next to it but you'll have to go to the link to see it, and other other line up of cars there.) Cool site.