On this one I think you will, properly machined and assembled. The heads are more than
"barely touched" (452's with 2.18 valves, back cut and set up for the Erson roller) and
remember this is a 470; not a 400 or 440.
Similar engines (compression, camshaft etc. - more than one) have been reportedly making
620-660 hp with the TFS heads and I doubt that the heads are worth more than 100 - 120 hp
over his prepped 452's.
Lets here from IQ52 and Mike at MRL on their opinions.