perhaps it's better now, back in 20 15, getting a custom cam took a couple months, the missile rockers took over a month, finding someone with a program to CNC port the heads and get it done took months. Took over a year to find a 5/8 stroker crank. If you just order everything out of a catalog, I'm sure it would go quicker, but then it is unlikely that you will make 700 horse NA either.