I think your best bet is a 3 blade CNC. I've been happy with my Acme 541.
1996 FlightCraft Barefooter—Merc 200 EFI
1991 ProStar 190—Acme 475, GT40-P heads, Edelbrock Performer intake, Mallory YLM Ignition (SOLD!)
The world is full of youth—what we need is a fountain of smart!