I never could figure out how if a forged 408 rotating assembly is about $2k how you could rack up $6k to $8k in machine shop services.
I guess $6k is if you had iron "X" heads and the $8k is if you had aluminum Eddy heads
Bore cylinders
Hone cylinders
deck the block
Line hone mains
Hot tank
install cam barings
install freeze plugs
Balance the rotating assembly
sum = probably about a grand.
......Heck, I'm counting 7500 bucks and I'm tired of typing and nowhere near done adding up enough stuff to make a complete engine....but yes, building it yourself saves a bunch, but it is still not cheap unless you build for low power and/or use a bunch of junk yard stuff. JMO.
To the OP, I would stoke it....but I like big torque, and big power and don't mind spending a little more coin to get it.