Hi new member long time reader
I am building a sled pulling truck that requires iron heads. Big blocks are limited to. 472ci but must run factory castings. I have a set of 286 heads with one being cracked and in need of welding. Small blocks are limited to 434ci and can run aftermarket heads but must be cast iron. I also have a couple sets of w2 heads Rpm would need to be run around 8,000 to 8,500. If going small block I would get a 48 degree block and heads. Which heads would make more power if ported and the rest of the combo is correct. Thanks Grant