I say big block, I am kinda partial tho lol. I have a 440, 30 over, 10 to 1, .519 lift, 440 source aluminum heads, edelbrock single plane intake, shifting at 5,800 rpm car runs 11.80's all day long. 3.73 sure grip 8.75. Full interior, full of gas, and drive it to the track and back home on drag radials. Now the install of a big block is a bit more complicated into an A body thats for sure. The biggest expense would be the headers. I'm sorry, but you just can't beat the torque of a big block.
