What will it run?

I was going to tell you to "Walk it out" but you did so and for the best time even. On my 4spd ride, on the street, I have to walk it out a bit. I apply as much throttle as it can take and up to the point but not beyond just radically spinning the tires. (The engine has a lot of power & and can just sit and roast the hides until the cow's come home. So it is a balance to walk.)

What size carb were you thinking about?
Try a dual plane intake. My old 318 did very well with a LD4B I think it was. Finding a intake for the old odd bolt angle LA can take time. (If that is the old head on top.)