i have found a 74' 455 yy code, with 73' 4x heads 2.11/1.66 valves 114cc chambers, motor looks complete all accesories and brackets minus a/c compressor and breather.
1) is this a good jumping off point for a performance street build?
2)are these heads worth spending the money on to have ported?
3)will the heads need to be milled to increease compression?
4) should the exhaust valve be enlarged?
5) do the 74' blocks have thiner wall, or did that start in 75',along with stronger steel?
thanks for your time and knowledge, tim