Jeff is right. There is much more to "getting ready for boost" than building an engine. Suspension, drivetrain, complete fuel system etc
In my case, I've been throwing handfuls of money at a rusty engine block I bought since 2010 and maybe this will show you how fast $5k will disappear:
Eagle/JE rotating assembly: $1500
Machine work and labor to assemble shortblock: $1500
HCI: $1500
Valvetrain: $600
Bare SVO engine block: $500
Oil pan/pick-up/dipstick: $300
Balancer: $200....
Do you see where this is going? That doesn't even get it off the engine stand, I haven't even gotten to injectors, mass air meter, throttle body, new cold air intake, fuel rails, external fuel pressure regulator... The list goes on and on and on.... I just bought an IRS and that is gonna soak up at least another $2k.. Oh, and I need new tires $800+ sheesh