My 273 turned out to be a 318...what did I buy?

I really like your car and i would drive the wheels off of it , that said you should check to see if an inertia switch was wired into the fuel pump circuit . You don't want to be the main attraction at a weiner roast .
I have been called a weiner in the past but I prefer to remain uncooked. I'll definitely look into the inertia switch.