I recently purchased 351C shortblock for my 70 Mustang daily driver. I have a 347 stroker in it right now with a single plane intake, stock ported heads, and a 600 cfm holley 4160 (for good gas milage). My question is which heads should I find for the cleveland? 2v, 4v, or aussie 2v closed chamber? I already have no low end torque with the single plane intake and I've been comfortable driving it for years with A/C, power steering, the works. Would I lose even more low end torque going with 4v heads? Since I'm already used to feathering the gas to start, I'd like to get the most power I can without being rediculously boggy on the street. I'm planning on using a single plane intake on the cleveland as well.