Actually, I send out a cam form and custom grind each cam to
the user's needs. 207/215 is an SC cam for most people w/SPI
and it can handle lots of boost. I have cheap(er) upgrade springs
for many cams or awesome hi-dollar springs for all years. And it is
true, certain years can use stock springs with certain grinds, and stock
pushrods with many SPI grinds.