If you check out the supplied links:
MSD 6-BTM CD Ignitions 6462 - SummitRacing.com
From $2600 to 2900 for the kit with more parts yet to buy
A easy $500 for a MSD and ignition parts
And we haven't even bought a 750 Holley or mod'ed for a blower
Still haven't bought a cam and kit
Still haven't bought headers and exhaust
Still haven't bought acceptable heads and done the machine work
A easy $5000 to $6000 that as you said is trail and error that if a mistake is made you then have $6000 invested setting in the shop in pcs.
That pixs with a blurred head shot...........................well
I think if I have to hand hold these blower advises given so a more accurate cost factor is posted,maybe it is you that should spent more time on the porch.
The turbo's can be had for next to nothing.And do not cost anything in the loss of power to drive them as a belt driven blowers do.