Premium unleaded, or do you need to add booster to it…?
And I’m seeing a 10.3:1 compression ratio for that engine, so yea, it’ll probably knock around with regular.
What brand are the intake and the carb…?
Sorry for all the questions, but I’m an old car guy.
Years ago, I had these 2 friends that dropped a 327 Chevy small block into a ‘75 Vega. That thing was fun at the local track, but they never could get the rear suspension dialed in quite right and it would hop off the line about half the time.
Back in the day, my Pop owned a ‘57 Chevy with the Power Pack option. That option included a 4 bbl carb, upgraded heads and cam, and dual exhaust, which added about 20 hp. Some gold trim on the car denoted the Power Pack.
Nothin’ like the sound of a 4 bbl carb with the secondaries kicked in…!!!

Anyway, fun stuff…!