How about Eco-Boost V8’s, they would be fun.
If Ford still made the E series vans, that’s where you would see that V8 - in place of the V10. That, and the maintenance & fuel requirements sour me on forced air.
Realism, cost, and maintenance issues aside, what would it take for one of those to be put on a ‘67 Mustang? Depending on what Ford has in that capacity, the power to weight ratio would make that all kinds of fun.